Lyme disease–carrying ticks are now in half of all U.S. counties

The ticks that transmit Lyme disease, a debilitating flulike illness caused by Borrelia bacteria, are spreading rapidly across the United States. A new study shows just how rapidly. Over the past 20 years, the two species known to spread the disease to humans have together advanced into half of all the counties in the United States.







Read More: http://www.sciencemag.org/news/2016/01/lyme-disease-carrying-ticks-are-now-half-all-us-counties