Long-term Lyme disease antibiotic therapy beliefs among New England residents.

Most physicians prescribe Lyme disease antibiotic therapy regimens that are recommended by the Centers for Disease Control and Prevention, the Infectious Disease Society of America, and the National Institutes of Health. An alternative approach by some physicians consists of prolonged antibiotic treatment for >2 months because they believe that Lyme disease often results in persistent Borrelia burgdorferi infection. Understanding how patients perceive the disease is important for effective doctor-patient communication. We conducted interviews and surveys on Block Island, Rhode Island, and Storrs, Connecticut, to explore the public perception of persistent symptoms following Lyme disease and the need for long-term treatment. Most of our participants believed that symptoms and the Lyme disease bacteria can persist after antimicrobial therapy for Lyme disease. When asked about the value of continuing antibiotic treatment for >2 months, about half thought that it was sometimes useful and about a quarter thought it was always useful. Almost all of the respondents stated that they knew people who had experienced Lyme disease, and these personal observations were more frequently cited as an important source of Lyme disease information than official sources such as medical professionals. We conclude that healthcare workers should review the scientific literature regarding appropriate therapy for Lyme disease, discuss such information with their patients, and identify sources of information that their patients can review. Medical societies, private foundations, and State and Federal Health agencies should increase efforts to educate physicians and the general public about the standard diagnosis and treatment of Lyme disease and provide additional funding to determine why some people experience persistent symptoms following this infection.

Reinfection and relapse in early Lyme disease.

To determine whether recurrent episodes of appropriately treated Lyme disease are caused by reinfection or relapse, we monitored pertinent clinical manifestations and serology of residents of an endemic site each year for 14 years. Of 253 episodes of early Lyme disease recorded among 213 residents, we observed 40 recurrent episodes. Virtually all included an erythema migrans (EM) rash that appeared at body sites that differed from those of the initial rash, no subjects produced detectable levels of specific antibody between sequential episodes, all episodes occurred a year or more after the initial EM episode, and all occurred during late spring and early summer. People experiencing recurrent episodes tended to have frequent contact with vector ticks. Prompt administration of standard antibiotic therapy for early Lyme disease reliably eliminates persistent infection and prevents relapse.

Increasing health burden of human babesiosis in endemic sites.

Human infection due to Babesia microti has been regarded as infrequent and a condition primarily affecting the elderly or immunocompromised. To determine whether risk in endemic sites may be increasing relative to that of Borrelia burgdorferi and to define its age-related clinical spectrum, we carried out a 10-year community-based serosurvey and case finding study on Block Island, Rhode Island. Less intensive observations were conducted in nearby sites. Incidence of babesial infection on Block Island increased during the early 1990s, reaching a level about three-fourths that of borrelial infection. The sera of approximately one-tenth of Block Island residents reacted against babesial antigen, a seroprevalence similar to those on Prudence Island and in southeastern Connecticut. Although the number and duration of babesial symptoms in people older than 50 years of age approximated those in people 20 to 49 years of age, more older adults were admitted to hospital than younger adults. Few Babesia-infected children were hospitalized. Babesial incidence at endemic sites in southern New England appears to have risen during the 1990s to a level approaching that due to borreliosis.

Disease-specific diagnosis of coinfecting tickborne zoonoses: babesiosis, human granulocytic ehrlichiosis, and Lyme disease.

To determine whether a unique group of clinical and laboratory manifestations characterize certain major deer tick-transmitted human pathogens in North America, we compared the symptoms, short-term complications, and laboratory test results of New England residents who became ill due to > or =1 of these pathogens. Patients completed a uniformly structured questionnaire and submitted blood samples for serologic and polymerase chain reaction (PCR) testing after developing symptoms of Lyme disease, human babesiosis, or human granulocytic ehrlichiosis (HGE). Complete blood count with thin blood smear, PCR, and immunoglobulin M antibody tests helped differentiate the acute manifestations of these diseases. Physicians should consider use of tests designed to diagnose babesiosis and HGE in patients with Lyme disease who experience a prolonged flulike illness that fails to respond to appropriate antiborrelial therapy.