Word: ehrlichia
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...southern half of the U.S. and the ever present deer tick in the north. It was once thought to afflict only dogs and horses, but four strains of bacteria that affect people have been identified in the past decade. Last week came word that a fifth strain, called Ehrlichia ewingii, which is particularly common among dogs in Missouri, can cause illness in their masters as well...
...have Lyme disease at all. Instead he had contracted human granulocytic Ehrlichiosis, or HGE -- a newly discovered tick-borne disease that has stricken at least 90 people in New York, Minnesota, Wisconsin and a few other states since 1990, resulting in four deaths. The infection is caused by the Ehrlichia bacterium, a distant cousin of the microbe responsible for Rocky Mountain spotted fever. Fortunately, Quinn had gone to specialists who recognized the infection and cured him with the antibiotic doxycycline. "I had no idea it could be fatal," he says. "Looking back, I'm glad I didn't know...
...there a definitive test for the disease. Doctors must base their diagnosis on such circumstantial evidence as abnormal spots on white blood cells and a low level of white cells or platelets in the blood. Furthermore, the drug most commonly used for Lyme disease -- amoxicillin -- is useless against the Ehrlichia bacteria...
Scientists, who once believed that Ehrlichia attacked only dogs and horses, now know that at least two species of Ehrlichia can infect humans. One causes HGE, and the other causes a disease called monocytic Ehrlichiosis, a flulike illness first identified in the western hemisphere nine years ago. HGE is spread by the deer tick in Northern states, while monocytic Ehrlichiosis is a mostly Southern syndrome that travels in the Lone Star tick. The disease is found in 30 states, including Texas and Oklahoma. More than 400 cases of monocytic Ehrlichiosis, nine of them fatal, have been documented since...
...areas for fear of encountering ticks carrying Lyme disease, a potentially chronic, arthritis-like condition. Now the Journal of the American Medical Association has reported on another tick-borne disease, which struck 25 people in Wisconsin and Minnesota, killing two. It is caused by a new variety of the Ehrlichia bacterium, which was first detected in humans in 1954. Doctors are concerned because life-threatening Ehrlichia infections may be misdiagnosed as Lyme disease or even a bad cold...
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