Physician and scientist; co-discoverer of the cause of #LymeDisease. Research on LD, relapsing fever, and ticks. Author of Lyme Disease @jhupress
What is Lyme Disease?
Lyme disease (LD) is an infection caused by Borrelia burgdorferi, a type of bacterium called a spirochete (pronounced spy-ro-keet) that is carried by deer ticks(Click here for pictures of deer ticks). An infected tick can transmit the spirochete to the humans and animals it bites. Untreated, the bacterium travels through the bloodstream, establishes itself in various body tissues, and can cause a number of symptoms, some of which are severe. Often, an erythema migrans (EM) rash appears within 7-14 days at the site of a tick bite (click to see picture of a typical EM rash).
LD manifests itself as a multisystem inflammatory disease that affects the skin in its early, localized stage, and spreads to the joints, nervous system and, to a lesser extent, other organ systems in its later, disseminated stages. If diagnosed and treated early with antibiotics, LD is almost always readily cured. Generally, LD in its later stages can also be treated effectively, but because the rate of disease progression and individual response to treatment varies from one patient to the next, some patients may have symptoms that linger for months or even years following treatment. In rare instances, LD causes permanent damage.
Although LD is now the most common arthropod-borne illness in the U.S. (more than 150,000 cases have been reported to the Centers for Disease Control and Prevention [CDC] since 1982), its diagnosis and treatment can be challenging for clinicians due to its diverse manifestations and the limitations of currently available serological (blood) tests.
The prevalence of LD in the northeast and upper mid-west is due to the presence of large numbers of the deer tick’s preferred hosts – white-footed mice and deer – and their proximity to humans. White-footed mice serve as the principal “reservoirs of infection” on which many larval and nymphal (juvenile) ticks feed and become infected with the LD spirochete. An infected tick can then transmit infection the next time it feeds on another host (e.g., an unsuspecting human).
The LD spirochete, Borrelia burgdorferi, infects other species of ticks but is known to be transmitted to humans and other animals only by the deer tick (also known as the black-legged tick) and the related Western black-legged tick. Studies have shown that an infected tick normally cannot begin transmitting the spirochete until it has been attached to its host about 36-48 hours; the best line of defense against LD, therefore, is to examine yourself at least once daily and remove any ticks before they become engorged (swollen) with blood.
Generally, if you discover a deer tick attached to your skin that has not yet become engorged, it has not been there long enough to transmit the LD spirochete. Nevertheless, it is advisable to be alert in case any symptoms do appear; a red rash (especially surrounding the tick bite), flu-like symptoms, or joint pains in the first month following any deer tick bite could signal the onset of LD.
Manifestations of what we now call Lyme disease were first reported in medical literature in Europe in 1883. Over the years, various clinical signs of this illness have been noted as separate medical conditions: acrodermatitis, chronica atrophicans (ACA), lymphadenosis benigna cutis (LABC), erythema migrans (EM), and lymphocytic meningradiculitis (Bannwarth’s syndrome). However, these diverse manifestations were not recognized as indicators of a single infectious illness until 1975, when LD was described following an outbreak of apparent juvenile arthritis, preceded by a rash, among residents of Lyme, Connecticut.
Where is Lyme Disease Prevalent?
LD is spreading slowly along and inland from the upper east coast, as well as in the upper midwest. The mode of spread is not entirely clear and is probably due to a number of factors such as bird migration, mobility of deer and other large mammals, and infected ticks dropping off of pets as people travel around the country. It is also prevalent in northern California and Oregon coast, but there is little evidence of spread.
In order to assess LD risk you should know whether infected deer ticks are active in your area or in places you may visit. The population density and percentage of infected ticks that may transmit LD vary markedly from one region of the country to another. There is even great variation from county to county within a state and from area to area within a county. For example, less than 5% of adult ticks south of Maryland are infected with B. burgdorferi, while up to 50% are infected in hyperendemic areas (areas with a high tick infection rate) of the northeast. The tick infection rate in Pacific coastal states is between 2% and 4%.
Data on the Number of Reported Cases of Lyme Disease in the U.S., 2005-2014
To view most recent data, click here.
The spirochetal agent of Lyme disease, Borrelia burgdoferi, is transmitted to humans through a bite of a nymphal stage deer tick Ixodes scapularis (or Ixodes pacificus on the West Coast). The duration of tick attachment and feeding is a key factor in transmission. Proper identification of tick species and feeding duration aids in determining the probability of infection and the risk of developing Lyme disease.
The early symptoms of LD can be mild and easily overlooked. People who are aware of the risk of LD in their communities and who do not ignore the sometimes subtle early symptoms are most likely to seek medical attention and treatment early enough to be assured of a full recovery.
The first symptom is usually an expanding rash (called erythema migrans, or EM, in medical terms) which is thought to occur in 80% to 90% of all LD cases. An EM rash generally has the following characteristics:
- Usually (but not always) radiates from the site of the tickbite
- Appears either as a solid red expanding rash or blotch, OR a central spot surrounded by clear skin that is in turn ringed by an expanding red rash (looks like a bull’s-eye)
- Appears an average of 1 to 2 weeks (range = 3 to 30 days) after disease transmission
- Has an average diameter of 5 to 6 inches
(range = 2 inches to 2 feet)
- Persists for about 3 to 5 weeks
- May or may not be warm to the touch
- Is usually not painful or itchy
EM rashes appearing on brown-skinned or sun-tanned patients may be more difficult to identify because of decreased contrast between light-skinned tones and the red rash. A dark, bruise-like appearance is more common on dark-skinned patients.
Ticks will attach anywhere on the body, but prefer body creases such as the armpit, groin, back of the knee, and nape of the neck; rashes will therefore often appear in (but are not restricted to) these areas. Please note that multiple rashes may, in some cases, appear elsewhere on the body sometime after the initial rash, or, in a few cases, in the absence of an initial rash.
Around the time the rash appears, other symptoms such as joint pains, chills, fever, and fatigue are common, but they may not seem serious enough to require medical attention. These symptoms may be brief, only to recur as a broader spectrum of symptoms as the disease progresses.
As the LD spirochete continues spreading through the body, a number of other symptoms including severe fatigue, a stiff, aching neck, and peripheral nervous system (PNS) involvement such as tingling or numbness in the extremities or facial palsy (paralysis) can occur.
The more severe, potentially debilitating symptoms of later-stage LD may occur weeks, months, or, in a few cases, years after a tick bite. These can include severe headaches, painful arthritis and swelling of joints, cardiac abnormalities, and central nervous system (CNS) involvement leading to cognitive (mental) disorders.
The following is a checklist of common symptoms seen in various stages of LD:
Localized Early (Acute) Stage:
- Solid red or bull’s-eye rash, usually at site of bite
- Swelling of lymph glands near tick bite
- Generalized achiness
Early Disseminated Stage:
- Two or more rashes not at site of bite
- Migrating pains in joints/tendons
- Stiff, aching neck
- Facial palsy (facial paralysis similar to Bell’s palsy)
- Tingling or numbness in extremities
- Multiple enlarged lymph glands
- Abnormal pulse
- Sore throat
- Changes in vision
- Fever of 100 to 102 F
- Severe fatigue
- Arthritis (pain/swelling) of one or two large joints
- Disabling neurological disorders (disorientation; confusion; dizziness; short-term memory loss; inability to concentrate, finish sentences or follow conversations; mental “fog”)
- Numbness in arms/hands or legs/feet
If you think you have LD symptoms you should see your physician immediately. The EM rash, which may occur in up to 90% of the reported cases, is a specific feature of LD, and treatment should begin immediately.
Even in the absence of an EM rash, diagnosis of early LD should be made on the basis of symptoms and evidence of a tick bite, not blood tests, which can often give false results if performed in the first month after initial infection (later on, the tests are more reliable). If you live in an endemic area, have symptoms consistent with early LD and suspect recent exposure to a tick, present your suspicion to your doctor so that he or she may make a more informed diagnosis.
If early symptoms are undetected or ignored, you may develop more severe symptoms weeks, months or perhaps years after you were infected. In this case, the CDC recommends using the ELISA and Western-blot blood tests to determine whether you are infected. These tests, as noted above, are considered more reliable and accurate when performed at least a month after initial infection, although no test is 100% accurate.
If you have neurological symptoms or swollen joints your doctor may, in addition, recommend a PCR (Polymerase Chain Reaction) test via a spinal tap or withdrawal of synovial fluid from an affected joint. This test amplifies the DNA of the spirochete and will usually indicate its presence.
Issues and Insights Related to the Diagnosis of Lyme Disease:
2-tired Antibody Testing for Early and Late Lyme Disease Using Only and Immunoglobulin G Blot with the Addition of a VlsE Band and the Second-tier Test Rapid, Simple, Quantitative , and Highly Sensitive Antibody Detection for Lyme Disease
Updates and Recent Reports
Announcements from the FDA and CDC on the Diagnosis of Lyme Disease
Recommended courses and duration of treatment for both early and late Lyme symptoms are shown in our Table of Recommended Antibiotics and Dosages (see also table footnotes).
Early treatment of LD (within the first few weeks after initial infection) is straightforward and almost always results in a full cure. Treatment begun after the first three weeks will also likely provide a cure, but the cure rate decreases the longer treatment is delayed.
Doxycycline, amoxicillin and ceftin are the three oral antibiotics most highly recommended for treatment of all but a few symptoms of LD. A recent study of Lyme arthritis in the New England Journal of Medicine indicates that a four-week course of oral doxycycline is just as effective in treating late LD, and much less expensive, than a similar course of intravenous Ceftriaxone (Rocephin) unless neurological or severe cardiac abnormalities are present. If these symptoms are present, the study recommends immediate intravenous (IV) treatment.
Treatment of late-Lyme patients can be more complicated. Usually LD in its later stages can be treated effectively, but individual variation in the rate of disease progression and response to treatment may, in some cases, render standard antibiotic treatment regimens ineffective. In a small percentage of late-Lyme patients, the disease may persist for many months or even years. These patients will experience slow improvement and resolution of their persisting symptoms following oral or IV treatment that eliminated the infection.
Although treatment approaches for patients with late-stage LD have become a matter of considerable debate, many physicians and the Infectious Disease Society of America recognize that, in some cases, several courses of either oral or IV (depending on the symptoms presented) antibiotic treatment may be indicated. However, long-term IV treatment courses (longer than the recommended 4-6 weeks) are not usually advised due to adverse side effects. While there is some speculation that long-term courses may be more effective than the recommended 4-6 weeks, there is currently no scientific evidence to support this assertion. Click here for an article from the New England Journal of Medicine which presents clinical recommendations in the treatment and prevention of early Lyme disease.
Current Clinical Studies
NIAID Clinical Trials
Two Controlled Trials of Antibiotic Treatment in Patients with Persistent Symptoms and a History of Lyme Disease ( The above clinical trials were conducted under the following protocols that were approved by the NIAID Clinical Studies Group, the Institutional Review Board, the NIAID Biostatistics Group, and the Food and Drug Administration (FDA) before the trails were conducted. To ensure complete compliance with the protocols, all procedures associated with the trials were carefully monitored by an independent Data Safety and Monitoring Board (DSMB) that included several distinguished biostatisticians. Note that the protocols stipulated that an interim statistical analysis be performed when 100 subjects have been enrolled.)
More Information on Treatment Guidelines
Research and Clinical Studies
Editor’s Note: Since ceftriaxone has been reported to have profound neuroprotective effects (Nature 433: 73-77, 2005) and is often used to treat Lyme disease with neurological complications, clinical studies are now in progress to assess its efficacy in the treatment of ALS.
A Case Revealing the Natural History of Untreated Lyme Disease ( Although the data are not shown in the publication, the author confirms that the IgG Western blot was positive by the CDC criteria and showed the presence of 21,28,30,39,41,45,58,66, and 93 kDa bands. )
How to Evaluate the Claims About Cures and Treatments for Long-term, Chronic Conditions
Studies on Chronic Lyme Disease Syndromes
News Articles and Commentaries
Peer-Reviewed Scientific Publications
Clinical Trials on the Efficacy of Extended Antibiotic Therapy
Two Controlled Trials of Antibiotic Treatment in Patients with Persistent Symptoms
and a History of Lyme Disease ( The above clinical trials were conducted under the following protocols that were approved by the NIAID Clinical Studies Group, the Institutional Review Board, the NIAID Biostatistics Group, and the Food and Drug Administration (FDA) before the trails were conducted. To ensure complete compliance with the protocols, all procedures associated with the trials were carefully monitored by an independent Data Safety and Monitoring Board (DSMB) that included several distinguished biostatisticians. Note that the protocols stipulated that an interim statistical analysis be performed when 100 subjects have been enrolled.)
Time for a different approach to Lyme disease and long-term symptoms
(For additional perspective on this important issue, see “The Pain of Chronic Lyme Disease: Moving the Discourse in a Different Direction“)
Lyme Disease and Co-Infections
Commentaries and Reviews on Lyme Disease
From the Desk of the Executive Director
- Ending the Lyme Disease Wars
- Chronic Lyme Disease: in Defense of the Scientific Enterprise
- Lyme Borreliosis is not Sexually Transmitted
- The Pain of Chronic Lyme Disease: Moving the Discourse in a Different Direction
- What do the Experts Recommend about the Treatment of Lyme Disease?
- Borreliaburgdorferi vs Treponema pallidum – what’s in a name?
- There is no published evidence supporting the diagnosis of chronic, atypical tick-borne co-infections in patients diagnosed with chronic Lyme disease.
- The results of European studies show that patients with early Lyme disease are rarely co-infected with other tick-transmitted agents.
- Understanding Chronic Pain
- Resurrecting the ‘yuppie vaccine’
- Understanding Antibody-based Diagnostic Tests for Lyme Disease
- Popular antibiotics may carry serious side effect.
- The Media Must Exercise Greater Responsibility in Reporting Information on Lyme Disease
- Is there a need to conduct still more clinical trials on the benefit of extended antibiotic therapy for the treatment of persistent post-treatment symptoms of Lyme disease?
- What Can One Learn That is Clinically Relevant from the Results of in vitro Studies on Persisters?
Misinformation on Lyme Disease
Bacteria produce only two types of toxins: endotoxins, which are non-secreted lipopolysaccharides (LPSs) that make up a large part of the cell wall of gram-negative bacteria; and, exotoxins that are secreted by some gram-positive bacteria and a few strains of gram-negative bacteria.
At one time, Borrelia burgdorferi, was thought to possess an endotoxin since a product isolated from B. burgdorferi was reported to be pyrogenic for rabbits, mitogenic for human mononuclear cells and mouse spleen cells, capable of clotting limulus lysate (a diagnostic test for LPS), and cytotoxic for mouse macrophages; these are properties generally ascribed to bacterial LPS (1). However, subsequent studies revealed the absence of lipid A and other chemical structures characteristic of classic gram-negative endotoxins (2). Although B. burgdorferi does not produce an endotoxin, it does possess lipoproteins that interact with Toll-like receptors (TLRs) on the surface of mammalian cells that comprise the innate immune system, to cause them to release inflammatory products that result in tissue damage and some of the clinical manifestations of Lyme disease (3-9).
There is abundant evidence to show that treatment with a short course of oral antibiotics is likely to cure active infection by B. burgdorferi (10); however, it is possible that some biologically active lipoproteins from dead bacterial cells persist in host tissues for periods of time after the initial infection has been cured.
Although some claim that B. burgdorferi produces a potent neurotoxin, there is no published, peer-reviewed evidence indicating that B. burgdorferi is an exotoxin-producing bacterium. In fact, the genomic sequence data do not reveal the presence of genes that encode for either key structural elements of any known bacterial exotoxin, or components of a secretory apparatus required for the export and delivery of an exotoxin (11).
In view of these considerations, treatment regimens for Lyme disease based on the neutralization -- or removal by chelation-- of a yet-to-be-identified neurotoxin should be viewed with much skepticism; such quackery is not only likely to be a waste of time and money, but also has the potential to cause great harm. There is no clinical evidence to indicate that such treatments are safe or effective.
1. Beck, G., G.S. Habicht, J.L. Benach, and J.L. Coleman. 1985. Chemical and biological characterization of a lipopolysaccharide extracted from the Lyme disease spirochete, (Borrelia burgdorferi). J. Infect. Dis. 152: 108-117.
2. Takayama, K., R.J. Rothenberg, and A.G. Barbour. 1987. Absence of lipopolysaccharide in the Lyme disease spirochete, Borrelia burgdorferi. Infect. Immun. 55: 2311-2313.
3.Wooten, R.M. and J.J. Weis. 2001. Host-pathogen interactions promoting inflammatory Lyme arthritis: use of mouse models for dissection of disease processes. Current Opinion in Microbiol. 4: 274-279.
4. Aliprantis, A.O., R.B. Yang, M.R. Mark, et al. 1999. Cell activation and apoptosis by bacterial lipoproteins through Toll- like receptor-2. Science 285: 736-739.
5. Brightbill, H.D., D.H. Libraty. S.R. Krutzik, et al. Host defense mechanisms triggered by microbial lipoproteins through Toll-like receptors. Science 285: 732-736.
6. Hirschfield, M., C.J. Kirschning, R. Schwandner. et al., 1999. Inflammatory signaling by Borrelia burgdorferi lipoproteins is mediated by Toll-like receptor-2. J. Immunol. 163: 2382-2386.
7. Lien, E., T.J. Sellati, A. Yoshimura, et al. 1999. Toll-like receptor- 2 functions as a pattern recognition receptor for diverse bacterial products. Chemistry 274: 33419-33425.
8. Ozinsky, A., D.M. Underhill, J.D. Fontenot, et al. 2000. The repertoire for pattern recognition of pathogens by the innate immune system is defined by cooperation between Toll-like receptors. Proc. Nat. Acad. Sci. 97: 13766-13771.
9. Alexopoulou, L., V. Thomas, M. Schnare, et al. Hyporesponsiveness to vaccination with Borrelia burgdorferi Osp A in humans and in TLR-1 and TLR-2 deficient mice. Nature Medicine 8: 878-884.
10. Wormser, G.P., R.J. Dattwyler, E.D. Shapiro, et al. 2006. The clinical assessment, treatment, and prevention of Lyme disease, human granulocytic anaplasmosis, and babesiosis: clinical practice guidelines by the Infectious Disease Society of America. Clin. Infect. Dis. 43: 1089-1134.
11. Fraser, C., S. Casjens, W.M. Huang, et al. (1997). Genomic sequence of a Lyme disease spirochete, Borrelia burgdorferi. Nature 390: 580-586.
The Plum Island Animal Disease Center (PIADC), that is now managed by the U.S. Department of Agriculture, is dedicated to research on plant and large animal diseases likely to have a significant economic impact on the livestock and agricultural industries. Because of its isolation from the main land mass and stringent containment facilities, it is ideally suited for such work. In 1952, it was managed by the U.S. Army Chemical Corps as a component of its biological warfare program. However, when that program was abolished by a Presidential directive in 1969, it was transferred to the U.S. Department of Agriculture for its present use.
Some claim that Lyme disease was introduced into the northeastern region of the U.S. by a man-made strain of Borrelia burgdorferi that escaped from a high containment biological warfare laboratory on Plum Island. However, there is ample evidence to indicate that both Ixodes ticks and B. burgdorferi were present in the U.S. well beforethe Plum Island facility was ever established. An examination of museum specimens ofIxodes ticks showed that the presence of Lyme disease spirochetes in suitable arthropod vectors preceded -- by at least a generation -- the year (1982) when Lyme disease was first recognized as a distinct clinical entity in the U.S. (1, 2). More recent studies revealed that Ixodes ticks and B. burgdorferi were present in the northeastern and Midwestern regions of the U.S. in pre-colonial times and many thousands of years before European settlements were established in the U.S. (3). Lyme disease certainly existed in the U.S. long before anyone knew how to diagnose and treat it.
Although the per capita incidence of Lyme disease in the Northeastern United States is more than twice that in the Midwestern United States, the prevalence of B. burgdorferiin the tick vector is nearly identical in both regions. The disparity in the incidence of disease did not appear to be due to a disparity in human invasiveness since a genetic analysis revealed that B. burgdorferi population in the Northeast and Midwest shard a recent common ancestor. This suggests that substantial evolutionary divergence in human invasiveness has not occurred and that the disparity in the incidence of disease between the two regions may be due to animal ecology or human behavior (4).
Finally, the prehistoric remains of "The Ice Man"--more than 5,000 years old-- provide positive evidence of infection by Borrelia burgdorferi(http://ngm.nationalgeographic.com/2007/07/iceman/hall-text) .
1. Persing, DH, Telford, SR III, Rys, PN, Dodge, DE, White, TJ, Malawista, SE and Spielman, A. Detection of Borrelia burgdorferi DNA in museum specimens of Ixodes damimini ticks. Science 249: 1420-1423, 1990.
2. Burgdorfer, W, Barbour, AG, Hayes, SF, Benach, JL, Grunwaldt, E, and Davis, J.P. Lyme disease: a tick-borne spirochetosis? Science 216: 1317-1319,1982.
3. Hoen, AG, Margos, G, Bent, S.J. Duik-Wasser, MA, Barbour, A, Kurtenbach, K, and Fish, D. Phylogeography of Borrelia burgdorferi in the eastern United States reflects multiple independent Lyme disease emergence events. Proc. Natl. Acad. Sci. 106: 15013-15018, 2009.
4. Brisson, D., Vandermause, M.F., Meece, J.K., Reed, K.D. and Dykhuizen. Evolution of Northeastern and Midwestern Borrelia burgdorferi in the United States. Emerg. Infect. Dis. 16: 911-917, 2010.
This photo has been reproduced from the more detailed version of the Tick Map found on the Home Page of the ALDF website. It summarizes current information, from 2006 - 2008) on the incidence of infected Ixodes ticks, as well as reported cases of Lyme disease in the continental United States.
Note that no Ixodes scapularis or I. pacificus ticks are found in some States, and that there are several States in which I. scapularis or I. pacificus have been reported, but host-seeking nymphs -- the major transmitters of Lyme disease -- are extremely low as well as the prevalence of infection. Since Lyme disease is not a sexually transmitted disease and is transmitted to humans only by infected Ixodes ticks (see preceding articles in this section), it is not surprising that most (>95%) reported cases of Lyme disease occur in those States (the Northeastern and Upper Mid-Central States) where host-seeking nymphal I. scapularis ticks are abundant.
Ixodes ticks are not found in the Arizona, Colorado, Idaho, Montana, Nevada, North Dakota, Utah, and Wyoming. Consequently, it is reasonable for residents of those States with non-specific symptoms often associated with Lyme disease in the absence of positive serological tests conducted by validated standard procedures and possible exposure to Ixodes ticks from visits to endemic areasto consider other possibilities to explain their symptoms.
Although Amblyoma americanum ticks sometimes carry a strain of Borrelia called Borrelia lonestarii, there is no evidence to indicate that B. lonestarii produces disease in humans (1). Furthermore, A. americanum has not been shown to be a competent vector for B. burgdorferi, the spirochete that causes Lyme disease (2,3).
1. Wormser, G.P., Masters, E., Livedris, D. et al. "Microbiologic evaluation of patients from Missouri with erythema migrans." Clin, Infect. Dis. 40: 423-428, 2005.
2. Ledia, K.E., N.S. Zeidner, J.M. Riberio, et al. "Borreliacidal activity of saliva from the tick Amblyomma americanum. Med.Vet. Entomol. 19: 90-95, 2005.
3. Piesman, J., and C.M. Kapp. "Ability of the Lyme disease spirochete Borrelia burgdorferi to infect rodents and three species of human-biting ticks (blacklegged tick, American dog tick, lone star tick). J. Med. Entomol. 34: 451-456, 1997.
Some Lyme disease patient advocates claim that there is a causal relationship between amyotrophic lateral sclerosis (ALS) and Lyme disease, simply because some patients with ALS appear to test positive in serological tests for Lyme disease. However, the results of recent clinical studies negate the validity of such a relationship. An examination of 414 patients with ALS who also underwent validated serological tests for Lyme disease, showed that only 24 (5.8%) were seropositive for Lyme disease; furthermore, the medical record of only 4 of these seropositive patients (0.97%) confirmed previous infection by Borrelia burgdorferi(1). In another larger study conducted in the U.S., more that 4,000 patients with ALS also were tested for Lyme disease; only 30 (<1%) were found to be positive based on the results of validated ELISA and Western Blot tests (2). Such a low incidence (<1%) is comparable to the background incidence of positive tests in individuals without ALS in the population at large (3). The results of a case controlled study (4), in which 491 patients diagnosed with ALS were compared to 982 normal controls, no differences in the seroprevalence of antibodies specific for B. burfdorferi were found between ALS patients (4.1%) and controls (5.9%). All of these findings indicate that Lyme disease is rare in patients with ALS, and provide no support for a causal relationship.
It should be noted that several β-lactam antibiotics, including ceftriaxone often used to treat Lyme disease with neurological symptoms, have been shown to possess profound neuroprotective effects that are independent of their antimicrobial properties (5); such unanticipated beneficial effects might be misinterpreted to suggest the elimination of a persistent infection as a result of antibiotic therapy. Because of these neuroprotective effects, that can be rather profound in some cases, clinical trials are now underway to examine if extended ceftriaxone therapy might be beneficial in the treatment of ALS (6). This in no way implies that ALS is due to a persistent infection that requires prolonged antibiotic therapy to cure.
1. Qureshi, M, Bedlack, RS, and Cudkowicz, ME. Lyme disease serology in amyotrophic lateral sclerosis. Muscle and Nerve 40: 626-628, 2009.
2. The ALSUntangled Group. ALSUntangled update 1: investigating a bug (Lyme Disease) and a drug (Iplex) on behalf of people with ALS. Amyotrophic Lateral
Sclerosis 10: 248-250, 2009.
3. Murphree, B, Kugeler, K, and Mead, P. Surveillance for Lyme disease—United States 1992-2006. www.cdc.gov/mmwr/PDF/ss/ss5710.pdf.
4. Visser, AE, Verduyn, Lunel, FM, Veldink, JH, and van den Berg, LH. No association between Borrelia burgdorferi antibodies and amylotrophic lateral sclerosis in a case-control study. Eur. J. Neurol. Jan 24 (1): 227-230, 2017.
5. Rothstein, JD, Patel, S, Regan, MR et al. β-lactam antibiotics offer neuroprotection by increasing glutamate transporter expression. Nature 433: 73-77, 2005.
6. Clinical trials on the use of ceftriaxone in patients with ALS http://clinicaltrials.gov/ct2/results?term=ceftriaxone+and+ALS
The view that Lyme disease induces autism in children has been advanced by the Lyme-Induced Autism Foundation (LIAF) which claims that up to 90% of autistic children are infected with Borrelia (1). There are no published data to substantiate such a claim. Having a positive ELISA or Western Blot test is not proof of active infection; it might indicate the presence of antibodies that are the result of past infection with Borrelia burgdorferi, the causative agent of Lyme disease. Such antibodies may persist at low levels, months to years after the active infection has been cured by appropriate antibiotic therapy. In some persons, a positive ELISA or Western blot is due to a non-specific cross-reaction (i.e., a false positive test).
There are serious problems with the quality of the laboratory tests used to support the claim that a large percentage of autistic children are seropositive for Lyme disease. First, the actual data upon which the claim is based have never been published in a peer reviewed scientific journal; this casts doubts on their accuracy. Second, there has been no independent confirmation to establish that the results are valid and reproducible. Third, in many cases, it appears that non-standard criteria were used to interpret the Western blots that were used to support an association between Lyme disease and autism. Such criteria are at variance with those recommended by the CDC, thereby resulting in a significant number of false positive tests. Consequently, the unpublished results of the serological tests reported by the LIAF must be viewed with grave skepticism.
The results of two recent carefully conducted controlled studies completely refute the erroneous claim of the LIAF, namely, that Lyme disease induces autism in children (2,3).
It should also be noted that data on the prevalence of autism and Lyme disease (number of reported cases per 100,000 residents) for nine States (Al, AR, CO, GA, MD, MO, NC, PA, SC, and WI) for the years 2004 and 2006, provide no indication of an association between Lyme disease and autism (4,5). An analysis by Spearman's rank correlation test yields r values of 0.234 and 0.317 for the years 2004 and 2006, respectively. In this particular method of statistical analysis, r values must be at or very close to 1.0 to affirm a close association between Lyme disease and autism. Furthermore, the average age at which the first signs/symptoms of autism occur in children is lower than that of Lyme disease, and there is no evidence that autistic children are exposed to ticks at a greater frequency than normal children.
Since families with autistic children already suffer enormous financial and emotional burdens, they should not have their hopes needlessly raised by unproven speculations that are not supported by scientific evidence. It would be irresponsible and even harmful to treat autistic children with extended antibiotic therapy, as some physicians are already recommending and doing, in the absence of indisputable evidence of a persistent infection. Neither the National Institutes of Health nor the Autism Science Foundation, which fund almost all of the research on autism and have developed many promising and successful approaches for treating autism, have any evidence to support a link between Lyme disease and autism.
2. "Serologic markers of Lyme disease in children with autism".
Ajamtan, M., Kosofsky, B.E., Wormser, G.P., Rajadhyalsha, A., and Alaedini, A.
JAMA 309: 1771-1772, 2013.
3. "Lack of serum antibodies against Borrelia burgdorferi in children with autism"
Burbelo, P.D., Swedo, S.E., Thurm, A., Bayal, A., Levin, A.E., Marques, A.,
and Iadorola, M.J.
Clinical Vaccine Immunology, May 2013, on-line ahead of print publication.
4. Autism and Developmental Disabilities Monitoring Network Report of 2009(http://www.cdc.gov/ncbddd/autism/states/ADDMCommunityReport2009.pdf).
5. Reported Lyme Disease Cases by State, 1999-2008(http://www.cdc.gov/ncidod/dvbid/lyme/ld_rptdLymeCasesbyState.htm
Although the report by M.J. Middelveen et al. (1), suggests that Lyme disease may be a sexually transmitted infection, it relies solely on the detection ofBorrelia in the semen and vaginal secretionsof a small number of people; there is no evidence to date indicating that borreliosis can be transmitted in this manner. Based on little more than these preliminary and unconfirmed observations, Stricker and Middleveen (2), nevertheless, have proposed that their results “might create a paradigm shift that would transform Lyme disease from a tick-borne illness into a sexually transmitted infection”. This is nonsense to say the least
Because Borreliaburgdorferihas been reported to elicit a generalized disseminated infection in several well-characterized animal models of borreliosis, it is not surprising that sprirochetes have been isolated from the spleen, eyes, kidneys, liver, tested and the brain of infected animals, several days after infection (3, 4). However, the concept that borreliosis can be transmitted by direct contact or sexually of was refuted several years ago by the well-designed, peer-reviewed published studies of Moody and Barthold (5), as well as Woodrum and Oliver (6), internationally known experts on Lyme disease.These investigatorsused well-characterized animal models of borreliosis in which infection is much more disseminated and profound than it is in humans. It should be noted that, in the United States, Lyme borreliosis has historically been defined as atick borne infection caused by Borreliaburgdorferisensulato(7).
To determine if borreliosis can be transmittedby direct contact, Moody and Barthold (5) housed three-day-old (or three-week-old) Lewis rats, deliberately infected with B.burgdorferi, with normal, uninfected ratsfor 30 days. As expected, all deliberatelyinfected rats continued to be actively infected, 30 days later; however, none of the uninfected rats acquired infection after 30 days of intimate direct contact withtheir infected cage mates.
In other experiments, Moodyand Barthold (5) were unable to demonstrate venereal transmission of borreliosisfrom seven infected females-or sixinfected males -to uninfected rats of the oppositesex. In the work of Woodrum and Oliver (6), six female Syrianhamsters infected with B.burgdorferiwere mated with six uninfected males; conversely, three infected males were mated with six uninfected females. None of the uninfected hamsters became infected after matingwith an infected partnerof the opposite sex, indicatingthat borreliosisis not sexually transmitted.Obviously, the mere presence of borrelia in genital tissues does not mean that infection can be transmitted sexually. It should be noted that epidemiological data do not support the view that Lyme disease is sexually transmitted. Extensive data collected by the CDC indicate that 96% of all reported cases of Lyme disease occur in 14 States (http://www.cdc.gov/lyme/stats/index.html ), a pattern that is strikingly different from that for sexually transmitted diseases. Woodrum and Oliver (6) likewisefailed to demonstratecontact transmission of B. burgdorferibetween infected female-or male-hamsters and uninfected hamsters of the opposite sex. Itwas not possible to transmit borreliosisto uninfected hamsters with urine or feces from infected hamsters.
Sadly, the observations of Middleveen et al.(1) have already generated an inordinate amount of fear and anxiety within the lay community due to sensationalized reports of their unconfirmed findings by an uncritical -and often naïve -press. This has already caused much harm, as evidenced by the fact that I have received numerous inquiries from distraught individuals, wondering if they now should even consider marrying their previously diagnosed and treated spouse-to-be for fear of getting Lyme disease and/orrisking the possibility of giving birth to an infected or congenitally deformed child.
To examine the issue of in uterotransmission of boreliosis, Moody and Barthold (5) inoculated pregnant female Lewis rats with viable B. burgdorferi, at four days of gestation. All of the inoculated pregnant females became seropositive as expected, and B. burgdorfericould be cultured from their spleens at 20 days of gestation; however, their placentas and fetuses were culture negative, indicting the lack of
in uterotransmission. Moody and Barthold (5)used two different experimental protocols to determine if transplacental transmission of B. burgdorferioccurs. One protocol involved six non-pregnant infected females that were subsequently mated and became pregnant. Three of the females were allowed to carry to full term, whereas the remaining three were sacrificed just prior to parturition. All offspring
and offspring-to-be were found to be culture negative for B. burgdorferi, as well as seronegative for antibody specific for B. burgdorferi, indicating that transplacental transmission of infection does not occur. In the second protocol, six females were infected viatick bite after becoming pregnant, and were allowed to carry their fetuses to birth; all were negative for infection. The resultsof these studies likewise failed to provide evidence for the transplacental transmission of naturally acquired borreliosis.
Other investigators examined the possibility of congenital birth defects in humanswith Lyme diseaseby doing a rather large comparative study involving 5,000 infants, half from an area in which Lyme disease was endemic and half as controls froman area without Lyme disease (8). They found no significant differences in the overall incidence of congenital malformations between the two groups.
In another study, involving 1,500 subjects including controls,no increased risk of giving birth to a child with a congenital heart defect wasnotedin women who had either been bitten by a tick or had been treated for Lyme disease during or before pregnancy (9).Finally, an extensive analysisof the world literature revealed“that an adverse outcome due to maternal infection with B. burgdorferiat any point during pregnancy in humans is at most extremely rare” (10).
Phillip J. Baker, Ph.D.
American Lyme Disease Foundation
P.O. Box 466
Lyme, CT 06371
1. Middleveen, MJ, Burke, J, Mayne, PJ, and Stricker, RB. F1000Research 27 Apr 2015,(doi 10.126881/f1000research.5778.33:309
2. Stricker, RB, and Middleveen, 1MJ. Sexual transmission of Lyme disease: challenging the tickborne disease paradigm. Expert. Rev. Anti. Infect. Ther. 2015; 11:1303-1306.
3. Johnson,RC, Marek, N, and Kodner, C. Infection of Syrian hamsters with Lyme disease spirochetes. J. Clin. Microbiol. 1984; 20:1099-1101.
4. Barthold, SW, Persing, DH, Armstrong, AL, and Peeples, RA. Kinetics of Boreliaburgdorferidissemination and evaluation of disease after intradermal inoculation of mice. Amer. J. Pathol 1991; 139:263-273.
5. Moody, KD and Barthold, SW. Relative infectivity of Borreliaburgdorferiin Lewis rats by various routes of inoculation. Amer. J. Trop. Med. Hyg. 1991;44:135-139.
6. Woodrum, JE and Oliver, JH Jr. Investigation of venereal, transplacental, and contact transmission of the Lyme disease spirochete, Borreliaburgdorferi,in Syrian hamsters. J. Parasitol. 1999;85:426-430.
7. Wormser, GP and O’Connell, S. Treatment of infection caused by Borreliaburgdorferisensulato. Expert. Rev. Anti. Infect. Ther 2011;9:245-260.
8. Williams, CL, Strobino, B, Weinstein, A,etal Maternal Lyme disease; congenital malformations and a cord blood serosurvey in endemic and control areas. Paediatr. Perinat. Epidemiol. 1995;9:320-330.
9. Strobino, B, Abid, S, and Gewitz, M. Maternal Lyme disease and congenital heart disease: a case control study in an endemic area. Amer. J. Obstet. Gynecol 1999;180:711-716.
10. Elliot, DJ, Eppes, SC, and Klein, JD. Teratology Update: Lyme disease. Teratology 2001;64:276-286.
Lyme disease affects the nervous system. This statement is both accurate and terrifying since, for many of us, damage to the brain is the most feared consequence of disease. However, when it comes to Lyme disease, much of this fear is misplaced. Lyme disease can affect the lining of the brain, a disorder known as meningitis. Other than causing fever and bad headaches, this form of meningitis is remarkably benign; nobody has ever died of it, and it has rarely -- if ever -- caused significant damage to any patient's brain. On extremely rare occasions, the infection can involve the brain or spinal cord, disorders that are now extraordinarily rare. Other patients can develop inflammation of various nerves, e.g., the nerves that control the muscles on one side of the face (Bell's palsy); this might occur in about 5% of untreated individuals. Other nerves can be affected, but even less frequently.
When considering these disorders, it is essential to recognize some key facts. First, the infection is highly responsive to antibiotics. Second, if the facial nerve has been severely damaged, there may be some residual weakness after treatment. However it is extraordinarily rare for there to be any permanent damage to the brain itself.
More importantly, there are many symptoms that occur in patients with Lyme disease and most other infections that may make one think there is a problem with the brain; however, that is not the case. Headaches, which are remarkably common in individuals with fever of any cause, are rarely due to a brain infection. Slowed thinking, with difficulty in concentrating, remembering or mentally focusing occurs to a greater or lesser extent in virtually everyone with an active inflammatory condition; however, it is almost never due to the disease affecting the brain itself. Rather, these are the effects of chemicals produced by the body in response to an infection or inflammation. These effects disappear as soon as the infection or inflammation resolves.
Since some patients with Lyme disease develop fatigue and thinking difficulties, some have suggested that these symptoms in isolation-- are strongly suggestive of this infection. However, this is misguided thinking. Studies have shown that symptoms such as these, which are severe enough to affect day-to-day functioning but are never due to nervous system disease, occur in over 2% of the population at large at any given time. In the U.S., this amounts to 6,000,000 people! Since there only about 30,000 cases of Lyme disease are reported each year, patients with Lyme disease obviously represent only a very tiny fraction of the total number of individuals with these symptoms.
There is a great deal of misunderstanding, among patients and doctors, about what laboratory test for the diagnosis of Lyme disease actually measure and what constitutes a positive test result.
The most common, widely used tests simply measure antibodies against the Lyme disease bacterium, Borrelia burgdorferi. Since antibodies are produced by the body's immune system to fight infection, detecting the presence of antibodies against bacteria or a virus is a good way to determine if someone has -- or had-- an infection. Some of the confusion about Lyme disease testing is due to the fact that different types of antibodies are produced at various stages of the infection. The type of antibody produced changes as the immune response to infection matures. Immunoglobulin M (IgM) develops first, during the first 7 to 10 days of infection; it is followed by the development of Immunoglobulin G (IgG), one to two weeks later. IgM is a less specific antibody that is quite a bit stickier than IgG. The stickiness of IgM makes tests that measure IgM less reliable and more likely to be falsely positive.
Why do we use IgM assays at all? It is because IgM is produced first. IgM can be found in people very early during infection, well before IgG antibody is produced. Within 1-2 weeks following the onset of infection, IgM antibodies to B. burgdorferi can be detected in the vast majority of infected individuals. However, after one month, IgG antibody responses predominate and there is no longer a need to depend on an unreliable assay based on the detection of IgM antibody. Thus, because of the limitations of IgM assays and the high rate of false positives, their use should be limited to the first month of infection; however, that frequently is not the case. A positive IgM test along with a negative IgG test after the first month of infection almost always results in a false positive test.
There are a number of different ways to measure antibodies against B. burgdorferi. The two most common procedures are by ELISA and Western blot. An ELISA is carried out on a plastic plate and measures the amount of antibody that binds to one or more B. burgdorferi proteins (antigens). A Western blot is like a bar code. Different kinds of B. burgdorferi proteins are separated by size on a strip of special paper and the antibodies in the patient's blood bind specifically to the proteins on the paper. The binding antibodies are then colored and the bar code is read. People who have been infected with B. burgdorferi have antibodies against certain specific proteins, thereby resulting in a positive bar code. What constitutes a positive pattern was established by the CDC in collaboration with many experienced physician scientists from major research centers based on thousands of comparative tests as well as an extensive analysis of antibodies known to be both specific and characteristic of various stages of B. burgdorferi infection.
There are some who claim that several important proteins (e.g., OspA, OspB, and other B. burgdorferi proteins or antigens) were not included in the positive pattern established by the CDC; however, these proteins were initially considered for inclusion, but were rejected because they did not contribute significantly to diagnosis. Although it is true that OspA and OspB antigens are indeed specific for B. burgdoreferi, these antigens are produced only when the bacterium is grown on artificial laboratory media or in the midgut of Ixodes ticks. Since these antigens are not -- or are only minimally produced -- during the course of a human infection, they are of little or no diagnostic value for human disease; the presence of other antibodies recommended in the CDC standard criteria predominate and thus are of greater relevance, as demonstrated by the results of thousands of comparative laboratory tests.
In sharp contrast to the CDC standard criteria, some doctors and commercial laboratories (e.g., IGeneX) use or advocate non-standard criteria that have not been validated by rigorous comparative studies by the CDC and or FDA (http://igenex.com/Website) . Consequently, the results of their tests fall outside the range of standard practice and have a much greater rate of false positives than one would get using the CDC criteria.
The CDC is responsible for guiding physicians in the appropriate use of laboratory tests for the diagnosis of Lyme disease and other infectious diseases. The CDC has warned about nonstandard testing and the interpretation of laboratory test results using unvalidated criteria. This carries great weight among mainstream physicians, as well as scientists working at State public health laboratories. Thus, the CDC criteria remain the standard and other criteria are considered to be unvalidated and unacceptable.
As is the case for most serologic assays, Lyme disease serologic assays are not by themselves diagnostic. A diagnosis of Lyme disease can only be made in the presence of well defined objective clinical abnormalities associated with Lyme disease. Because the presence of fatigue or vague aches and pains are too nonspecific, a positive serology in such individuals would have a very low positive predictive value. Simply demonstrating that someone has an immune response against B. burgdorefri does not mean that person is actively infected, or that any general symptoms have anything to do with B. burgdorferi infection. It also is important to realize that the immune system has memory. That means that an individual who makes a mature antibody response against any infecting bacterium or virus continues to have detectable antibodies in their blood. This is true for all infections, including Lyme disease. Thus, a positive test after someone has been treated is in fact normal and does not indicate on going infection.
There is no indeterminate designation in the CDC criteria. Also there is no separate CDC surveillance criteria for serologic assays. The lack of a positive serology in a patient without the clear objective abnormalities known to be associated with Lyme disease has a very high negative predictive value, indicating that patient does not have Lyme disease.
The CDC has issued the following statement which summarizes its views on the diagnosis of Lyme disease (LD):
A two-test approach for active disease and for previous infection using a sensitive enzyme immunoassay (EIA) or immunofluorescent assay (IFA) followed by a Western immunoblot is the algorithm of choice. All specimens positive or equivocal by a sensitive EIA or IFA should be tested by a standardized Western immunoblot. Specimens negative by a sensitive EIA or IFA need not be tested further. When Western immunoblot is used during the first 4 weeks of disease onset (early LD), both immunoglobulin M (IgM) and immunoglobulin G (IgG) procedures should be performed. A positive IgM test result alone is not recommended for use in determining active disease in persons with illness greater than 1 month's duration because the likelihood of a false-positive test result for a current infection is high for these persons. If a patient with suspected early LD has a negative serology, serologic evidence of infection is best obtained by the testing of paired acute- and convalescent-phase serum samples. Serum samples from persons with disseminated or late-stage LD almost always have a strong IgG response to Borrelia burgdorferi antigens.
Although Borrelia burgdorferi-like organisms have been observed in mosquitoes, horse flies, and deer flies in areas where Lyme disease is endemic, these organisms have not been cultured to verify their identity. Experiments attempting to transmit B. burgdorferi from infected to uninfected laboratory animals by mosquitoes have not been successful (1). Furthermore, epidemiological studies have shown that the date of onset for Lyme disease occurs in June, coincident with the peak abundance of nymphal Ixodes scapularis ticks, and not during August when mosquitoes and other biting files are at peak abundance (2). Despite findings of B. burgdorferi in other tick species such as the American dog tick (Dermacentor variabilis) and the lone star tick (Amblyomma americanum) in the field, laboratory transmission studies have confirmed that these tick species cannot transmit the infection to laboratory animals; thus, they are not competent vectors for Lyme disease (3). Both experimental and epidemiological studies have shown that Ixodes scapularis and Ixodes pacificus are the only tick species in North America that are capable of transmitting B. burgdorferi, the spirochete that causes Lyme disease, to humans. Please consult the Lyme Disease Risk Assessment Map on the home page of the ALDF website (www.aldf.com) for specific information on the incidence of Ixodes ticks as well as the numbers of reported cases of Lyme disease for individual States.
1. Magnarelli, LA, and Anderson, JF. J. Clin. Microbiol. 26: 1482-1486, 1988.
2. Falco, R.C., D.F. McKenna, T.J. Daniels, R.B. Nadelman, J. Nowakowski, D. Fish, and G.P. Wormser. Am. J. Epidemiol: 149: 771 -776, 1999.
3. Piesman, J. and Happ, CM. J. Med. Entomol. 34: 451-156, 1997.
The clear and simple answer is "no". According to Saunder's "Dictionary and Encyclopdeia of Laboratory Medicine and Technology", there are two definitions of the term "cyst". The first is used to describe any closed cavity or sac -- both normal and abnormal -- that is lined by epithelial cells, although in some locations, it may be lined by connective tissue or bone. The second is used to describe a stage in the life cycle of certain parasites (e.g., Echinococcus granulosus) during which they are
Quiz on Lyme Disease
Lyme Disease Stories
Informative videos about Lyme Disease
How To Find A Physician to Treat Lyme Disease
“Castle Connolly Best Doctors” provides an excellent way to find a local physician who is board certified in the specialty of infectious diseases. Select “Infectious Diseases” as the specialty, and then give your zip code (or city), as well as your State. In some cases, the physician has elected not to post his/her name and address on this web site; you then may have to consult your local telephone directory to get that information.
Finding and selecting the right physician to consult involves a number of factors and decisions that only you can make.
When you contact the physician you have selected, you might ask him/her about their experience in diagnosing and treating Lyme disease — or other tick-borne infections — and whether he/she follows the guidelines developed by the Infectious Diseases Society of America (IDSA) for the treatment of Lyme disease.
The IDSA guidelines, which are posted on the ALDF website, are almost universally accepted by experts on Lyme disease, and are in agreement with those of: the European Federation of Neurological Societies; the European Union of Concerted Action on Lyme Borreliosis; the American Academy of Neurology; the Canadian Public Health Network; and, the German Society for Hygiene and Microbiology. They also are in agreement with recommendations made by expert panels from 10 European countries, i.e., The Czech Republic, Denmark, Finland, France, The Netherlands, Norway, Poland, Slovenia, Sweden, and Switzerland. None of these organizations or expert panels, as well as the Centers for Disease Control (CDC) or the National Institutes of Health (NIH) recommends extended antibiotic therapy for the treatment of a condition known as “chronic Lyme disease”.
Prevention & Control
Larval and nymphal deer ticks often hide in shady, moist ground litter, but adults can often be found above the ground clinging to tall grass, brush, and shrubs. They also inhabit lawns and gardens, especially at the edges of woodlands and around old stone walls where deer and white-footed mice, the ticks’ preferred hosts, thrive. Within the endemic range of B. burgdorferi (the spirochete that infects the deer tick and causes LD), no natural, vegetated area can be considered completely free of infected ticks.
Deer ticks cannot jump or fly, and do not drop from above onto a passing animal. Potential hosts (which include all wild birds and mammals, domestic animals, and humans) acquire ticks only by direct contact with them. Once a tick latches onto human skin it generally climbs upward until it reaches a protected or creased area, often the back of the knee, groin, navel, armpit, ears, or nape of the neck. It then begins the process of inserting its mouthparts into the skin until it reaches the blood supply.
In tick-infested areas, the best precaution against LD is to avoid contact with soil, leaf litter and vegetation as much as possible. However, if you garden, hike, camp, hunt, work outdoors or otherwise spend time in woods, brush or overgrown fields, you should use a combination of precautions to dramatically reduce your chances of getting Lyme disease:
Managing Ticks on Your Property
How To Remove A Tick
First, using color and size as indicators, learn how to distinguish between:
Deer tick larva (top),
nymph (right) and adult (left).
- deer tick* nymphs and adults
- deer ticks and two other common tick species – dog ticks and Lone Star ticks (neither of which is known to transmit Lyme disease)*Deer ticks are found east of the Rockies; their look-alike close relatives, the western black-legged ticks, are found and can transmit Lyme disease west of the Rockies.
Lone star tick.
Then, when spending time outdoors, make these easy precautions part of your routine:
- Wear enclosed shoes and light-colored clothing with a tight weave to spot ticks easily
- Scan clothes and any exposed skin frequently for ticks while outdoors
- Stay on cleared, well-traveled trails
- Use insect repellant containing DEET (Diethyl-meta-toluamide) on skin or clothes if you intend to go off-trail or into overgrown areas
- Avoid sitting directly on the ground or on stone walls (havens for ticks and their hosts)
- Keep long hair tied back, especially when gardening
- Do a final, full-body tick-check at the end of the day (also check children and pets)
When taking the above precautions, consider these important facts:
- If you tuck long pants into socks and shirts into pants, be aware that ticks that contact your clothes will climb upward in search of exposed skin. This means they may climb to hidden areas of the head and neck if not intercepted first; spot-check clothes frequently.
- Clothes can be sprayed with either DEET or Permethrin. Only DEET can be used on exposed skin, but never in high concentrations; follow the manufacturer’s directions.
- Upon returning home, clothes can be spun in the dryer for 20 minutes to kill any unseen ticks
- A shower and shampoo may help to remove crawling ticks, but will not remove attached ticks. Inspect yourself and your children carefully after a shower. Keep in mind that nymphal deer ticks are the size of poppy seeds; adult deer ticks are the size of apple seeds.
Any contact with vegetation, even playing in the yard, can result in exposure to ticks, so careful daily self-inspection is necessary whenever you engage in outdoor activities and the temperature exceeds 45° F (the temperature above which deer ticks are active). Frequent tick checks should be followed by a systematic, whole-body examination each night before going to bed. Performed consistently, this ritual is perhaps the single most effective current method for prevention of Lyme disease.
If you DO find a tick attached to your skin, there is no need to panic. Not all ticks are infected, and studies of infected deer ticks have shown that they begin transmitting Lyme disease an average of 36 to 48 hours after attachment.Therefore, your chances of contracting LD are greatly reduced if you remove a tick within the first 48 hours. Remember, too, that nearly all of early diagnosed Lyme disease cases are easily treated and cured.
To remove a tick, follow these steps:
- Using a pair of pointed precision* tweezers, grasp the tick by the head or mouthparts right where they enter the skin. DO NOT grasp the tick by the body.
- Without jerking, pull firmly and steadily directly outward. DO NOT twist the tick out or apply petroleum jelly, a hot match, alcohol or any other irritant to the tick in an attempt to get it to back out.
- Place the tick in a vial or jar of alcohol to kill it.
- Clean the bite wound with disinfectant.*Keep in mind that certain types of fine-pointed tweezers, especially those that are etched, or rasped, at the tips, may not be effective in removing nymphal deer ticks. Choose unrasped fine-pointed tweezers whose tips align tightly when pressed firmly together.
Then, monitor the site of the bite for the appearance of a rash beginning 3 to 30 days after the bite. At the same time, learn about the other early symptoms of Lyme disease and watch to see if they appear in about the same timeframe. If a rash or other early symptoms develop, see a physician immediately.
Finally, prevention is not limited to personal precautions. Those who enjoy spending time in their yards can reduce the tick population around the home by:
- keeping lawns mowed and edges trimmed
- clearing brush, leaf litter and tall grass around houses and at the edges of gardens and open stone walls
- stacking woodpiles neatly in a dry location and preferably off the ground
- clearing all leaf litter (including the remains of perennials) out of the garden in the fall
- having a licensed professional spray the residential environment (only the areas frequented by humans) with an insecticide in late May (to control nymphs) and optionally in September (to control adults).