Mosquitoes carrying the West Nile virus were found in six Pennsylvania counties, along with one human case.
The state's West Nile Control Program said the mosquitoes were found Friday in Berks, Bucks, Chester, Delaware, Lancaster and Philadelphia. counties.
The West Nile virus human case was discovered in Chester County.
Friday was the last routine surveillance and reporting day for 2019, according to the State Department of Environmental Protection's website.
West Nile virus is a mosquito-borne illness that may cause encephalitis, a brain irritation. Mild infections can produce fever, headaches, body aches, skin rash and swollen lymph glands.
Copyright Associated Press