From PA West Nile Virus Control Program 8/8/17

To date this year in Chester County: 401 samples tested, 37 positives (meaning one or more mosquitoes in a test batch carried WNV virus; we do not know the size of each sample, so it could be one mosquito in 10 or 100+).

No human, equine or avian cases known in Chesco so far this year.

Municipalities of all positive samples in Chesco to date: