The Pennsylvania Department of Health has reported that Lyme disease incidence in ticks is currently at 27.4 per 100,000 residents in Chester County, compared to 12.4 and 16.9 in neighboring Montgomery County. The highest rates in the state were found in the Pennsylvania Tick Research lab, which tested 5,603 ticks and found 1,175 infected with some form of disease. The state is home to four species of ticks that transmit disease, including Lyme disease, which can cause a wide range of symptoms including fever, rash, facial paralysis, and arthritis. If left untreated, these symptoms can lead to respiratory failure. Other symptoms include high fever, severe headache, chills, and muscle aches. The most common form of Lyme disease is spread by blacklegged tick species.