Where to find data

See statewide data on West Nile virus by county here.  In 2014-15-16, Chester County had a total of 3 known human cases and no known WNV-related deaths.

Chesco health Department News Releases (including about mosquito spraying) here.

In 2016, 4 releases concerned mosquitoes and WNV, including 2 about spraying. See here.