West Nile virus is usually spread through the bite of an infected mosquito during the summer and fall. Your best bet to avoid the virus is to avoid mosquito bites when possible.

The Allegheny County Health Department on Monday confirmed that additional mosquito samples have tested positive for West Nile Virus, and seven more Pittsburgh neighborhoods will be treated as a result.

Carrollton sees more West Nile Virus in mosquito samples, prompting local spraying efforts and preventive advice.