Orange County’s first West Nile Virus (WNV) positive mosquito sample of the season was identified late July in northern Orange County through routine trapping and testing by the Orange County Mosquito and Vector Control District (OCMVCD). No human infections have been identified so far this season in Orange County.
The Aedes aegypti (the yellow fever mosquito), Aedes albopictus (Asian tiger mosquito) and Aedes notoscriptus (Australian Backyard Mosquito) have also been detected in Orange County. All three invasive Aedes mosquitoes bite aggressively during the day and lay their eggs in small containers of water. These mosquitoes are not native to California and can transmit Zika, dengue, chikungunya and yellow fever. There have been no recent cases of these viruses being transmitted locally in California.
It's important to prevent bites and remove breeding sources from your home and workplace. The District offers detailed information and tips to keep you and your family safe.