Mosquitos with West Nile Virus have spread to more than half the counties in Pennsylvania, the state’s Department of Environmental Protection said. The virus spreads through mosquito bites, primarily to birds such as crows but also to humans.

In response, there will be spraying this week in Point Breeze, Regent Square, Edgewood, Wilkinsburg, East Hills, Homewood, and Highland Park. Spraying is scheduled in those areas on Wednesday night between 8 and 11 p.