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Review Article

Current Concepts

A Critical Appraisal of “Chronic Lyme Disease”

Henry M. Feder, Jr., M.D., Barbara J.B. Johnson, Ph.D., Susan O'Connell, M.D., Eugene D. Shapiro, M.D., Allen C. Steere, M.D., Gary P. Wormser, M.D., and *the Ad Hoc International Lyme Disease Group

N Engl J Med 2007; 357:1422-1430October 4, 2007DOI: 10.1056/NEJMra072023

Article

Lyme disease, the most common tick-borne infection in the northern hemisphere, is a serious public health problem. In North America, it is caused exclusively by Borrelia burgdorferi sensu stricto (hereafter referred to as B. burgdorferi), whereas in Europe it is caused by B. afzelii, B. garinii, B. burgdorferi, and occasionally by other species of borrelia.1

This complex infection has a number of objective manifestations, including a characteristic skin lesion called erythema migrans (the most common presentation of early Lyme disease), certain neurologic and cardiac manifestations, and pauciarticular arthritis (the most common presentation of late Lyme disease), all of which usually respond well to conventional antibiotic therapy.2 Despite resolution of the objective manifestations of infection after antibiotic treatment, a minority of patients have fatigue, musculoskeletal pain, difficulties with concentration or short-term memory, or all of these symptoms. In this article, we refer to these usually mild and self-limiting subjective symptoms as “post–Lyme disease symptoms,” and if they last longer than 6 months, we call them “post–Lyme disease syndrome.”

The word “chronic” has been applied to Lyme disease in a wide variety of contexts and is sometimes used interchangeably with the preferred term “late Lyme disease.” For example, in Europe, certain late neurologic manifestations of previously untreated or inadequately treated infection, such as borrelial encephalomyelitis or long-standing meningitis, have been referred to as “chronic neuroborreliosis” (Table 1Table 1Selected Late or Long-Term Manifestations of Borrelia burgdorferi Infection.).1-3 In the United States, reports have described untreated patients with recurrent or persistent arthritis that lasts for up to several years, presumably because of active infection.4 The focus of this review, however, is not the objective manifestations of late Lyme disease but rather the imprecisely defined condition referred to as “chronic Lyme disease.” This term is used by a small number of practitioners (often self-designated as “Lyme-literate physicians”) to describe patients whom they believe have persistent B. burgdorferi infection, a condition they suggest requires long-term antibiotic treatment and may even be incurable.5 Although chronic Lyme disease clearly encompasses post–Lyme disease syndrome, it also includes a broad array of illnesses or symptom complexes for which there is no reproducible or convincing scientific evidence of any relationship to B. burgdorferi infection. Chronic Lyme disease is used in North America and increasingly in Europe as a diagnosis for patients with persistent pain, neurocognitive symptoms, fatigue, or all of these symptoms, with or without clinical or serologic evidence of previous early or late Lyme disease.

Chronic Lyme Disease

The diagnosis of chronic Lyme disease and its treatment differ substantively from the diagnosis and treatment of recognized infectious diseases. The diagnosis is often based solely on clinical judgment rather than on well-defined clinical criteria and validated laboratory studies, and it is often made regardless of whether patients have been in areas where Lyme disease is endemic.6,7 Although proponents of the chronic Lyme disease diagnosis believe that patients are persistently infected with B. burgdorferi, they do not require objective clinical or laboratory evidence of infection as a diagnostic criterion.5,8-10

Several lines of reasoning are used to provide support for this diagnostic rationale. One is the unproven and very improbable assumption that chronic B. burgdorferi infection can occur in the absence of antibodies against B. burgdorferi in serum (Table 2Table 2Laboratory Diagnosis of Lyme Disease and Chronic Lyme Disease in North America.). Negative results of serologic tests are often attributed to previous antibiotic therapy or to the theory that chronic infection with B. burgdorferi suppresses humoral immune responses; neither theory is well supported by scientific data.12-14 When physicians who diagnose chronic Lyme disease obtain laboratory tests to provide support for their diagnoses, they often rely heavily on “Lyme specialty laboratories.” Such laboratories may perform unvalidated in-house tests that are not regulated by the Food and Drug Administration, or they may perform standard serologic tests interpreted with the use of criteria that are not evidence-based.11,12,15-17

Once the diagnosis of chronic Lyme disease is made, patients are commonly treated for months to years with multiple antimicrobial agents, some of which are inactive in vitro against B. burgdorferi.2,5,18-20 Antibiotics may be prescribed either simultaneously or sequentially, and they are often administered parenterally. Occasionally, these patients are treated with unconventional and highly dangerous methods such as bismuth injections or deliberate inoculation of plasmodia to cause malaria.2,21,22 No other spirochetal infection, including the neurologic complications of tertiary syphilis, is managed in an analogous fashion.2,23 The duration of treatment commonly prescribed for chronic Lyme disease often far surpasses even the conventional 6-month course of therapy successfully used for most cases of tuberculosis.

Categories of Chronic Lyme Disease

Diagnoses of chronic Lyme disease appear to fall predominantly into one of four categories (Figure 1Figure 1The Four Predominant Categories of Disease Associated with Chronic Lyme Disease.).8-10 Patients with category 1 disease do not have objective clinical manifestations or laboratory evidence of B. burgdorferi infection, and they receive a diagnosis on the basis of the presence of nonspecific symptoms such as fatigue, night sweats, sore throat, swollen glands, stiff neck, arthralgia, myalgia, palpitations, abdominal pain, nausea, diarrhea, sleep disturbance, poor concentration, irritability, depression, back pain, headache, and dizziness.5 Nonspecific symptoms such as these are common, and some occur in more than 10% of the general population, regardless of whether Lyme disease is endemic in the area.24,25

Patients with category 2 disease have identifiable illnesses or syndromes other than Lyme disease. Such patients may or may not have a history of Lyme disease. They have received either a misdiagnosis or a diagnosis (e.g., multiple sclerosis) that they are reluctant to accept and have sought an alternative diagnosis from a physician willing to treat them for chronic Lyme disease.

Data from studies of patients who underwent reevaluation at academic medical centers suggest that the majority of patients presumed to have chronic Lyme disease have category 1 or 2 disease.8-10 Since patients in these two categories do not have evidence of active infection with B. burgdorferi, the potential benefit of treating them with antibiotics, beyond a placebo effect, would be attributable to the antiinflammatory or other nonantimicrobial effects of antibiotics.26 Antibiotic therapy in these patients is not warranted.

Patients with category 3 disease do not have a history of objective clinical findings that are consistent with Lyme disease, but their serum samples contain antibodies against B. burgdorferi, as determined by means of standardized assays that were ordered to investigate chronic, subjective symptoms of unknown cause.27 Patients with disease in this category have at most only equivocal evidence of B. burgdorferi infection, since the predictive value of positive serologic results in this setting is low.27,28 Although some clinicians would offer patients with category 3 disease an empirical trial of 2 to 4 weeks of an oral antibiotic, such patients should be told that the diagnosis is uncertain and that a benefit from treatment is unlikely.

Patients with category 4 disease have symptoms associated with post–Lyme disease syndrome.29-31 In prospective studies of patients with erythema migrans, subjective symptoms of unknown cause were present 1 year or more after treatment in 0.5 to 13.1% of patients.31 Whether this prevalence exceeds that of such symptoms in the general population is unknown, since none of these studies included a control group. A meta-analysis suggested that the prevalence of such symptoms exceeded that in control groups without Lyme disease, but this analysis relied on several retrospective studies in which the diagnosis and treatment of Lyme disease often did not meet current standards.30,31

Treatment of Post–Lyme Disease Symptoms

Controlled treatment trials have been conducted only for patients with category 4 disease. Data from three double-blind, randomized, placebo-controlled trials have shown that there is substantial risk, with little or no benefit, associated with additional antibiotic treatment for patients who have long-standing subjective symptoms after appropriate initial treatment for an episode of Lyme disease.32-34

One of these trials enrolled 78 patients who were seropositive for antibodies against B. burgdorferi at trial entry; a second trial enrolled 51 patients who were seronegative.32 All patients had antecedent objective signs of Lyme disease, most often physician-diagnosed erythema migrans. Patients were treated either with a 1-month course of ceftriaxone administered intravenously, followed by 2 months of doxycycline given orally, or with identical-appearing intravenous and then oral placebos. Patients were assessed at enrollment and 3 months after completion of treatment with the use of the Medical Outcomes Study 36-item Short-Form General Health Survey (SF-36). There were no significant differences in the scores between the patients in the antibiotic and placebo groups.

In a single-center trial conducted by Krupp et al., 55 patients with severe fatigue (as measured by an 11-item questionnaire) after treatment of well-documented Lyme disease underwent randomization to receive ceftriaxone or an identical-appearing placebo for 28 days.33 The investigators reported a reduction in scores for fatigue severity in the ceftriaxone group that exceeded the reduction in the placebo group by 13 percentage points (i.e., a reduction of 22% vs. 9%; P=0.01) but no significant improvement in cognitive function. There was no significant difference between the groups with regard to the degree of improvement in reported health status on the basis of the SF-36 score. Patients in the ceftriaxone group were significantly more likely than those in the placebo group to identify their treatment assignment correctly at the end of therapy, raising a concern that masking was compromised and that a placebo effect may explain the greater improvement in scores for fatigue severity in the treated group.33

Antibiotic therapy can cause considerable harm to patients treated for chronic Lyme disease or post–Lyme disease symptoms.2 Life-threatening anaphylaxis33 and biliary complications requiring cholecystectomy35 have occurred after ceftriaxone administration. Candidemia from infection of an intravenous catheter has resulted in death.36 In an unpublished study in which 37 patients underwent randomization to receive 10 weeks of treatment with either ceftriaxone or placebo, about one fifth of the patients had serious adverse events, the majority of which were related to intravenous catheters.37 In light of the risk of serious adverse events in their study, Krupp et al. concluded that “repeated courses of antibiotic treatment are not indicated for persistent symptoms following Lyme disease, including those related to fatigue and cognitive dysfunction.”33

Eligibility criteria for two controlled trials stipulated that symptoms must be severe enough to interfere with the patient's ability to function.32 Thus, the physical health status of the patients enrolled in these two studies was equivalent to that of patients with congestive heart failure or osteoarthritis.32 This finding was preordained by the study design, but it has been incorrectly interpreted by some to indicate that patients with post–Lyme disease symptoms typically are severely disabled.

The investigators who conducted the controlled treatment trials had great difficulty finding patients who met the criteria for entry, despite intensive efforts that included both the notification and involvement of Lyme disease support groups and associations.32,33 For two of the three studies, additional sites had to be engaged,32 and the enrollment period had to be extended for all three studies.32,33 To enroll 55 patients in one of the studies, investigators had to screen more than 500 people, most of whom were excluded because of the absence of a substantiated history of Lyme disease.33 This difficulty with enrollment appears to reflect the scarcity of persons with well-documented Lyme disease in whom clinically significant problems develop after conventional treatment.

Although anecdotal evidence and findings from uncontrolled studies have been used to provide support for long-term treatment of chronic Lyme disease,18-20 a response to treatment alone is neither a reliable indicator that the diagnosis is accurate nor proof of an antimicrobial effect of treatment. Many patients with intermittent or self-limited symptoms may feel better over time as a result of the natural course of their condition, and controlled trials indicate that nearly 40% of patients with post–Lyme disease symptoms have a positive response to placebo.32 In addition, the assessment of a change in symptoms may be confounded by antiinflammatory and other nonantimicrobial effects of antibiotics.26 Furthermore, the published reports of uncontrolled trials of antibiotic treatment for chronic Lyme disease used poorly standardized case definitions and either undefined criteria for interpreting immunoblots or criteria that have subsequently been found to have very low specificity (approximately 60%).38

Persistent B. burgdorferi Infection and Post–Lyme Disease Symptoms

A report by Phillips and colleagues39 is often cited to provide support for the hypothesis of persistent B. burgdorferi infection. They indicated that they detected B. burgdorferi in blood specimens from 43 of 47 patients who had received or were receiving prolonged antibiotic therapy for chronic Lyme disease (91%). Other investigators have been unable to reproduce these findings in patients with well-documented post–Lyme disease syndrome.32,40-42 Moreover, Phillips and colleagues used a new culture medium that specifically included Detroit tap water; this medium was subsequently shown to be bactericidal for B. burgdorferi.41 In contrast to the findings from their report,39 B. burgdorferi could not be detected in any of 843 specimens of blood or cerebrospinal fluid, tested by means of either culture or polymerase chain reaction (PCR), from the 129 patients enrolled in two of the controlled treatment trials.32,40 Moreover, there was no serologic evidence of tick-borne coinfections in the vast majority of patients.32

In another report, DNA of B. burgdorferi was detected by means of PCR in urine specimens from nearly three quarters of 97 patients who had received the diagnosis of chronic Lyme disease.43 However, the authors did not sequence the amplicons to confirm that the DNA was from B. burgdorferi. Such a high rate of positive results among patients who had been treated extensively with antibiotics is unlikely when one considers that only 1 of 12 urine samples (8%) from untreated patients with erythema migrans was found to be positive in a careful evaluation of this technique's value as a diagnostic test.44 Moreover, detection of bacterial DNA is not necessarily an indicator of either active infection or clinical disease.45 The central question is not whether a few spirochetes might persist after antibiotic treatment, but whether clinical disease can be attributed to their presence.

It is highly unlikely that post–Lyme disease syndrome is a consequence of occult infection of the central nervous system. This conclusion is based on evidence such as the absence of inflammation in the cerebrospinal fluid,32,33 negative results of both cultures and PCR assays for B. burgdorferi in the cerebrospinal fluid,32,40 the absence of structural abnormalities of the brain parenchyma,46 and normal neurologic function, with no effect of antibiotic therapy (as compared with placebo) on cognitive function.33,34

Additional evidence against the hypothesis that chronic symptoms are due to persistent infection is the fact that antibodies against B. burgdorferi in many of these patients are undetectable, which is inconsistent with the well-established immunogenicity of the spirochete's lipoproteins.13,14,20,29,32,47 Patients in whom treatment for most infectious diseases, including syphilis, has failed typically have persistent or rising titers of antibodies because of ongoing B-cell stimulation by microbial antigens.23

The lack of convincing evidence for the persistence of B. burgdorferi in treated patients (Table 3Table 3Evidence against Active Infection in Patients with Subjective Symptoms Persisting for More Than 6 Months after Antibiotic Treatment for Lyme Disease.) is not surprising.2,20,23,24,29-33,40,47-49 The failure of treatment for bacterial infections typically occurs as a result of pathogens that either have or acquire resistance to antibiotics, difficulties in achieving sufficient concentrations of antibiotic at sites of infection, or impaired host-defense mechanisms.2 None of these factors are generally applicable to infection with B. burgdorferi. Although B. burgdorferi can develop into cystlike forms in vitro under certain conditions that can be created in the laboratory,50 there is no evidence that this phenomenon has any clinical relevance. B. burgdorferi may penetrate cells in vitro, but there is no evidence that the organism may be sheltered from antibiotics during an intracellular phase and then disseminate and cause clinical relapse.51,52 Indeed, the strategies used by B. burgdorferi to adapt to the vertebrate host and evade host defenses indicate an extracellular existence.53

Advice to Clinicians

How should clinicians handle the referral of symptomatic patients who are purported to have chronic Lyme disease? The scientific evidence against the concept of chronic Lyme disease should be discussed and the patient should be advised about the risks of unnecessary antibiotic therapy. The patient should be thoroughly evaluated for medical conditions that could explain the symptoms. If a diagnosis for which there is a specific treatment cannot be made, the goal should be to provide emotional support and management of pain, fatigue, or other symptoms as required.54-56 Explaining that there is no medication, such as an antibiotic, to cure the condition is one of the most difficult aspects of caring for such patients. Nevertheless, failure to do so in clear and empathetic language leaves the patient susceptible to those who would offer unproven and potentially dangerous therapies. Additional advice to clinicians is included in the Supplementary Appendix, available with the full text of this article at www.nejm.org.

Chronic Lyme Disease in the Public Domain

Physicians and laypeople who believe in the existence of chronic Lyme disease have formed societies, created charitable foundations, started numerous support groups (even in locations in which B. burgdorferi infection is not endemic), and developed their own management guidelines.5 Scientists who challenge the notion of chronic Lyme disease have been criticized severely.

The attorney general of Connecticut has begun an unprecedented antitrust investigation of the Infectious Diseases Society of America, which issued treatment guidelines for Lyme disease that do not support open-ended antibiotic treatment regimens.2 In some states, legislation has been proposed to require insurance companies to pay for prolonged intravenous therapy to treat chronic Lyme disease. The media frequently disregard complex scientific data in favor of testimonials about patients suffering from purported chronic Lyme disease and may even question the competence of clinicians who are reluctant to diagnose chronic Lyme disease. All these factors have contributed to a great deal of public confusion with little appreciation of the serious harm caused to many patients who have received a misdiagnosis and have been inappropriately treated.

Conclusions

Chronic Lyme disease is the latest in a series of syndromes that have been postulated in an attempt to attribute medically unexplained symptoms to particular infections. Other examples that have now lost credibility are “chronic candida syndrome” and “chronic Epstein–Barr virus infection.”57,58 The assumption that chronic, subjective symptoms are caused by persistent infection with B. burgdorferi is not supported by carefully conducted laboratory studies or by controlled treatment trials. Chronic Lyme disease, which is equated with chronic B. burgdorferi infection, is a misnomer, and the use of prolonged, dangerous, and expensive antibiotic treatments for it is not warranted.2

The findings and conclusions in this article are those of the authors and do not necessarily represent the views of the Centers for Disease Control and Prevention.

Dr. Feder reports receiving lecture fees from Merck and serving as an expert witness in medical-malpractice cases related to Lyme disease. Dr. Johnson reports holding patents on diagnostic antigens for Lyme disease. Dr. O'Connell reports serving as an expert witness related to Lyme disease issues in civil and criminal cases in England. Dr. Shapiro reports serving as an expert witness in medical-malpractice cases related to Lyme disease, reviewing claims of disability related to Lyme disease for Metropolitan Life Insurance Company, and receiving speaker's fees from Merck and Sanofi-Aventis. Dr. Steere reports receiving a research grant from Viramed and fees from Novartis. Dr. Wormser reports receiving research grants related to Lyme disease from Immunetics, Bio-Rad, and Biopeptides and education grants from Merck and AstraZeneca to New York Medical College for visiting lecturers for infectious-disease grand rounds, being part owner of Diaspex (a company that is now inactive with no products or services), owning equity in Abbott, serving as an expert witness in a medical-malpractice case, and being retained in other medical-malpractice cases involving Lyme disease. He may become a consultant to Biopeptides. No other potential conflict of interest relevant to this article was reported.

We thank Alex P. Butensky, Julie Chacko, Rachel Hart, and Lisa Giarratano for assistance.

Source Information

From the Departments of Family Medicine and Pediatrics, Connecticut Children's Medical Center, Hartford, and University of Connecticut Health Center, Farmington (H.M.F.); Microbiology Laboratory, Division of Vector-Borne Infectious Diseases, Centers for Diseases Control and Prevention, Fort Collins, CO (B.J.B.J.); Lyme Borreliosis Unit, Health Protection Agency Microbiology Laboratory, Southampton General Hospital, Southampton, United Kingdom (S.O.); Departments of Pediatrics and Epidemiology and Public Health, Yale University School of Medicine, New Haven, CT (E.D.S.); Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston (A.C.S.); and the Division of Infectious Diseases, Department of Medicine, New York Medical College, Valhalla (G.P.W.)

Address reprint requests to Dr. Feder at the Departments of Family Medicine and Pediatrics, University of Connecticut Health Center, Farmington, CT 06030, or at .

Other members of the Ad Hoc International Lyme Disease Group who were authors are listed in the Appendix.

Appendix

The following members of the Ad Hoc International Lyme Disease Group were also authors: Gundersen Lutheran Medical Foundation, La Crosse, WI — W.A. Agger; National Microbiology Laboratory, Health Canada, Winnipeg, MB, Canada — H. Artsob; Johns Hopkins Medical Institutions, Baltimore — P. Auwaerter, J.S. Dumler; St. Luke's Hospital, Duluth, MN — J.S. Bakken; Yale University School of Medicine, New Haven, CT — L.K. Bockenstedt, J. Green; New York Medical College, Valhalla — R.J. Dattwyler, J. Munoz, R.B. Nadelman, I. Schwartz; Danbury Hospital, Danbury, CT — T. Draper; Johns Hopkins Medical Institutions, Crofton, MD — E. McSweegan; Atlantic Neuroscience Institute, Summit, NJ, and the New York University School of Medicine, New York — J.J. Halperin; Boston University School of Medicine and Boston Medical Center, Boston — M.S. Klempner; University of Connecticut School of Medicine and Connecticut Children's Medical Center, Farmington — P.J. Krause; Centers for Disease Control and Prevention, Fort Collins, CO — P. Mead; University of British Columbia, Vancouver, Canada — M. Morshed; University of Medicine and Dentistry of New Jersey– Robert Wood Johnson Medical School, Piscataway — R. Porwancher; University of Connecticut Health Center, Farmington — J.D. Radolf; Maine Medical Center, Portland, ME — R.P. Smith, Jr.; Schneider Children's Hospital at North Shore, Manhasset, NY — S. Sood; Washington Hospital Center and Georgetown University Medical Center, Washington, DC — A. Weinstein; Wadsworth Center, New York State Department of Health, Albany — S.J. Wong; and Connecticut Children's Medical Center, University of Connecticut, Hartford — L. Zemel.

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