Ticks capable of carrying and transmitting more than one potentially fatal disease at the same time are becoming increasingly common in the northeastern U.S., according to a new long-term analysis that raises fresh public health concerns for the region. The research found that a growing share of blacklegged ticks—also known as deer ticks—are infected with multiple disease-causing pathogens. The study was led by Cary Institute of Ecosystem Studies disease ecologist Shannon LaDeau and conducted