Health officials point to the EPA’s list of approved repellents as the best defense against mosquitoes that spread West Nile.

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

The infected mosquitoes have been located in several city neighborhoods, including Old Louisville, Irish Hill, California, Iroquois and Churchill Downs, officials said July 22. This follows mosquitoes testing positive for the virus in the Tyler Park and Highlands neighborhoods earlier this month.