The mosquitoes were found in Westminster and Costa Mesa just before Independence Day weekend.
“We are seeing a lot of mosquito activity in general this year, considerably more than usual,” said Brian Brannon, a spokesman for the Orange County Mosquito and Vector Control District.
“In a five-year average of mosquito abundance, we’re off the charts,” Brannon said. “Now we have positive West Nile Virus infections in 10 cities.”
Mosquitoes infected with West Nile virus have been found in Newport Beach, Buena Park, Costa Mesa, Garden Grove, Santa Ana, Seal Beach, Huntington Beach, Cypress, Fullerton and Westminster. The infected pests have been found in four traps in Buena Park, twice in Santa Ana, and five times in Fullerton, but once in the other cities.