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New Tick-Borne Disease on the Rise in Some Areas

WebMD Health News

July 17, 2000 (Atlanta) -- Ehrlichiosis, a sometimes-fatal disease spread by ticks, appears to be erupting in areas already hardest hit by Lyme disease, according to a report here at the International Conference on Emerging Infectious Diseases. Other reports suggest that the disease can cause long-lasting symptoms -- and that getting the disease once doesn't protect against getting it again.

"We actually do think infection is increasing in Connecticut," researcher Peter D. Guarino, MPH, tells WebMD. "All of a sudden we are seeing an explosion of cases." Guarino is a researcher with the Department of Veterans Affairs Cooperative Studies Program in New Haven, Conn.

Guarino's colleague, Yale University researcher James Meek, MPH, is more cautious. "I think ehrlichiosis is on the rise, but that has to be taken with a grain of salt," he tells WebMD. "We may just now be recognizing it more -- but it is possible that the [number] of the ticks is increasing."

In January 1995, Meek, Guarino, and colleagues began a laboratory-based surveillance program that included widespread public service announcements describing the symptoms of ehrlichiosis and warning of the danger of tick bites. Annual cases of ehrlichiosis increased from about 37 confirmed and probable cases in 1995 to 338 cases in 1998.

Most people who get ehrlichiosis get better without treatment, the researchers say. "We believe the normal immune system usually can handle this," Guarino says. "There probably are a lot more infections, but they aren't serious enough to cause people to go to the doctor and get blood drawn."

Ehrlichiosis comes in two forms -- human granulocytic ehrlichiosis (HGE) and human monocytic ehrlichiosis (HME) -- caused by two slightly different bacteria. HGE is spread by the same deer ticks that carry Lyme disease. Indeed, some individual ticks carry the bacteria that cause both diseases. HME is spread by the lone star tick.

Infection is difficult to diagnose and often requires a blood test. Symptoms appear three to 16 days after a tick bite and include fever, severe headache, muscle and joint pain, chills, cough, nausea, vomiting, and/or lack of appetite. Rash is uncommon and does not resemble the distinctive bull's-eye rash that marks Lyme disease.

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