Lyme Disease Risk Areas Pinpointed in Map

This map released by the Yale School of Public Health on Friday, Feb. 3, 2012 shows a map which indicates areas of the eastern United States where people have the highest risk of contracting Lyme disease based on data from 2004-2007. Researchers dragged sheets of fabric through the woods to snag ticks for the survey. The map shows a clear risk across much of the Northeast, from Maine to northern Virginia. Researchers at Yale University also identified a high-risk region across most of Wisconsin, northern Minnesota and a sliver of northern Illinois. Areas highlighted as emerging risk regions include the Illinois-Indiana border, the New York-Vermont border, southwestern Michigan and eastern North Dakota. (AP Graphic/Yale School of Public Health, Maria Diuk-Wasser)

Years of tracking Lyme disease and analyzing tick populations have allowed Yale researchers to pinpoint areas most at risk for the seasonal disease in 2012. According CBS, the map was drawn up in an attempt to improve the prevention, diagnosis and treatment of Lyme disease.

“The key value is identifying areas where the risk for Lyme disease is the highest, so that should alert the public and the clinicians and the public health agencies in terms of taking more precautions and potential interventions,” said study author Maria Diuk-Wasser with the Yale School of Public Health. “In areas that are low risk, a case of Lyme disease is not impossible but it’s highly unlikely, so the clinician should be considering other diagnoses.”

Researchers were able to pinpoint risk areas by years of study, which involved dragging sheets of fabric through the woods to collect ticks. The end result is a map published in the February issue of the American Journal of Tropical Medicine.

High risk areas were fairly predictable for those familiar with Lyme disease, but researchers also found that risk was spreading. High risk regions include Northeastern states from Maine to northern Virginia, the upper Midwest, and a small section of northern Illinois. Risk is spreading to the Illinois-Indiana border, the New York-Vermont border, southwestern Michigan and eastern North Dakota.

CBS noted that while the initial data used to create the map was collected between 2004 and 2007, the high-risk areas have not likely changed. Transitional areas may not be entirely accurate, but Diuk-Wasser believes the map is still useful because it highlights areas where tick surveillance ought to be increased. This new map is also unique in that it relies on the presence of ticks themselves, not simply reports of human infection. Lyme disease is caused by Borrelia burgdorferi bacteria, CBS said. Humans who are bitten by infected ticks will develop any combination of a bull’s-eye rash, fever, headache and fatigue. Antibiotics cure Lyme disease easily, but if the infection remains untreated it can lead to serious complications like arthritis, meningitis, facial paralysis and irregular heart rhythm.
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