First Detection of WNV in Fresno County mosquitoes.


FIREBAUGH, CALIFORNIA – The Fresno Westside Mosquito Abatement District has received confirmation that mosquito samples collected in the census-designated place of Tranquility, in Western Fresno County have tested positive for West Nile virus (“WNV”). WNV is transmitted via the bite of Culex mosquitoes. Most people that contract West Nile virus will show few to no symptoms. Others will show mild flu-like symptoms and severe cases can cause neurological problems such as, headache, confusion, disorientation, and dizziness. Some cases can result in paralysis, coma, or death. The elderly and those with weakened immune systems are more at risk for severe infections of West Nile virus.

The mosquito samples that tested positive for WNV are the first detection of the virus in Fresno County mosquitoes this year.  To request mosquito control inspection/service go to or call 559-659-2437.

To reduce the risk of being bitten by mosquitoes and exposed to mosquito-borne viruses such as SLEV or WNV, residents are urged to take the following precautions:
1) Drain all sources of standing water around your home. Remove unnecessary objects from around your home that can potentially hold water.
2) Report observed sources of standing water (i.e. unmaintained swimming pools) to the Fresno Westside Mosquito Abatement District (559) 659-2437 or at
3) Irrigation water on farms and other lands should not be allowed to stand for more than three days.
4) Report dead birds to 877-WNV-BIRD (877-968-2473) or
5) Repair window and door screens to prevent mosquitoes from entering buildings.
6) Wear long sleeves and pants if outdoors when mosquitoes are present.
7) Use a repellent containing DEET, oil of lemon eucalyptus, picaridin or IR3535, as recommended by the U.S. Centers for Disease Control and Prevention. Always read and follow the repellent label instructions..
8) Stock mosquitofish in domestic water features, such as backyard ponds and horse troughs. The District will place mosquitofish, at no cost, in backyard mosquito breeding sources.

For more information on West Nile virus:

Center for Disease Control:

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