ticks

ticks

"questing" female Ixodes scapularis

A "questing" female Ixodes scapularis (blacklegged tick) reaches out in hopes of climbing aboard a host. Researchers say the blacklegged tick, the primary vector of Lyme disease, was almost nonexistent in Pennsylvania in the 1960s but now is the state's dominant tick species. 

IMAGE: Joyce Sakamoto/Penn State