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.

Orange County officials have issued a health advisory after the West Nile virus was found in some of the area’s mosquitoes. “OCMVCD has confirmed mosquito samples testing positive for