Bill Todaro, a medical entomologist with the Allegheny County Health Department, sorts through a selection of deer tick specimens inside his office in the Strip District. Todaro estimates that 50 percent of ticks in the 'nymph' stage in the eastern parts of the country are infected with Lyme Disease.
Pictured are deer tick samples collected from Monroeville in June 2010. The smallest are nymphs and are the most infective. They feed on mice and pick up the Lyme disease bacteria from them. The medium-size ticks are in the adult phase, while the largest are engorged adults that have fed on a host.
Stephanie Strasburg | Tribune-Review
A bottle of Lyme disease vaccine is shown next to a deer tick at Good Shepherd Veterinary Hospital in Mars on Monday, April 15, 2013.