NAPA, Calif. – The Napa County Mosquito Abatement District detected the first mosquitoes positive for West Nile virus on Friday.

Two samples of mosquitoes collected in American Canyon tested positive for WNV.

“These first mosquitoes testing positive for West Nile Virus in Napa County this summer reminds us that we must protect ourselves and our families from mosquito bites,” said Napa County Public Health Officer Dr. Karen Relucio. “The good news is there are simple steps we can take at home and when we travel to stop mosquito bites, which can transmit viruses like West Nile.”

WNV is transmitted to humans and animals by the bite of an infected mosquito. The risk of serious illness to most people is low. 

Napa County Public Health recommends that individuals “Fight the Bite” and prevent exposure to mosquito bites by practicing the “Three Ds”:

1. Defend – Apply insect repellent containing DEET, picaradin, oil of lemon eucalyptus or IR3535 according to label instructions. Make sure that doors and windows have tight-fitting screens to keep out mosquitoes. Repair or replace screens with tears or holes.

2. Dawn and dusk – Most mosquitoes bite in the early morning and evening so it is important to wear proper clothing and repellent if outside during these times.

3. Drain – Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water including flower pots, old car tires, rain gutters and pet bowls.  If a swimming pool is not being properly maintained, or for other mosquito problems contact the Napa County Mosquito Abatement District at 707-553-9610.

California's WNV Web site, http://www.westnile.ca.gov/ , includes the latest information on WNV activity in the state.

Californians are encouraged to report all dead birds and dead tree squirrels on the website or by calling toll-free 1-877-WNV-BIRD (968-2473).

For questions about local mosquito surveillance and problems with mosquito control contact the Napa County Mosquito Abatement District at 707-553-9610.