Mosquitoes testing positive for West Nile virus were discovered in Anaheim and Garden Grove, the Orange County Mosquito and Vector Control District reports.

There have been three human cases of West Nile Virus in California this year, with one fatal case, according to the California Department of Public Health.

Efforts to battle mosquitoes carrying West Nile virus in Pennsylvania continue this week as the Bucks County Department of Health plans to spray multiple areas in Lower Makefield Township.