Once Rare, Infection by Tick Bites Spreads
By LAURIE TARKAN
Published: June 20, 2011
A potentially devastating infection caused by tick bites has gained a foothold in the Lower Hudson Valley and in coastal areas of the Northeast, government researchers have found.
The condition, called babesiosis, is a malaria-like illness that results from infection with Babesia microti, a parasite that lives in red blood cells and is carried by deer ticks. Though far less common than Lyme disease, babesiosis can be fatal, particularly in people with compromised immune systems.
Because there is no widely used screening test for babesiosis, its spread poses a particular threat to the blood supply, scientists said. “We are very worried about it and are doing everything in our power to address this,” said Sanjai Kumar, chief of the laboratory of emerging pathogens at the Food and Drug Administration.
According to a recent report by the Centers for Disease Control and Prevention, there were six cases of babesiosis in the Lower Hudson Valley in 2001 and 119 cases in 2008, a 20-fold increase. In areas where Lyme disease is endemic, like coastal Rhode Island, Massachusetts, Connecticut and Long Island, babesiosis also is becoming very common, said Dr. Peter Krause, senior research scientist at the Yale School of Public Health.
In one study of residents of Block Island, R.I., Dr. Krause found babesiosis to be just 25 percent less common than Lyme disease. Babesiosis also is spreading slowly into other regions where it did not exist before, like the Upper Midwest, said Dr. Krause.
Many people who are infected with the parasite have no symptoms at all, while others experience mild to moderate flu-like symptoms that may last for a few days or as long as six months. “But some people get so sick that they wind up hospitalized, put into an intensive care unit, or even dying,” said Dr. Gary Wormser, chief of infectious diseases at Westchester Medical Center in New York.
http://www.nytimes.com/2011/06/21/health/21ticks.html
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