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West Nile Virus detected in Stanislaus County
• No human cases detected as of last week
Mosquito WNV 2023
Infected mosquitoes spread West Nile Virus to humans and other animals when they bite. Across the state, West Nile Virus has been detected in 10 counties, as of Friday.

The Turlock Mosquito Abatement District and the East Side Mosquito Abatement District have both confirmed the presence of West Nile Virus in Stanislaus County, but has of yet there have been no human cases.

The Turlock Mosquito Abatement District has found the virus in one mosquito sample as of June 12. 

Across the state, West Nile Virus has been detected in 10 counties, as of Friday. Statewide it has been found in 31 mosquito samples and 31 dead birds. There have been no human cases thus far.

Officials believe the late rains will make for an active mosquito season this year. 

“The late rains and increased temperatures will hasten the development of West Nile virus in the Central Valley,” said Turlock MAD General Manager David Heft. “We urge residents to dump and drain any items around their home that may hold standing water and to use repellent when outside in the dawn and dusk hours.”

Mosquitoes become infected with West Nile Virus when they feed on infected birds. Infected mosquitoes can then spread West Nile Virus to humans and other animals when they bite, according to the Centers for Disease Control.

Approximately one in five people who are infected with West Nile virus will develop symptoms such as fever, headache, body aches, joint pains, vomiting, diarrhea, or rash. Less than one percent will develop a serious neurologic illness such as encephalitis or meningitis (inflammation of the brain or surrounding tissues). About 10 percent of people who develop neurologic infection due to West Nile virus will die, according to the CDC. People over 50 years of age and those with certain medical conditions, such as cancer, diabetes, hypertension, kidney disease, and organ transplants, are at greater risk for serious illness.

There are no medications to treat or vaccines to prevent West Nile Virus infection. People with milder illnesses typically recover on their own, although symptoms may last for several weeks or months. In the neuroinvasive forms, patients can suffer severe and sometimes long-term symptoms.

Mosquitoes like to breed in stagnant water, preferring weedy areas that provide cover. The lagoons at dairy farms make for perfect breeding grounds, but so do flooded fields, uncared for swimming pools, urban catch basins, overwatered lawns, and pretty much anything that holds water and allows it to stagnate.

The districts will continue with their treatment and surveillance programs by identifying mosquito breeding sources and mosquito borne disease activity. They will perform treatments according to their surveillance results. The Districts would like to remind residents that they can help by taking the following precautions:

• Dump or drain standing water. These are places mosquitoes like to lay their eggs.

• Defend yourself against mosquitoes by using repellants containing DEET, Picaridin or Oil of Lemon Eucalyptus.

• Avoid being outdoors at dusk and dawn. These are the times when WNV carrying mosquitoes are generally most active.

 •Report neglected swimming pools to your local mosquito abatement district.

• Use tight fitting door and window screens to keep mosquitoes from entering your home.

• Contact your veterinarian for information on vaccinating equine against WNV.

For additional information or to request service, Turlock residents should contact the Turlock Mosquito Abatement District at (209) 634-1234 or (

Reporting and testing of dead birds are important steps in preventing West Nile Virus. A confirmed case of the virus in dead birds or mosquito samples helps to identify areas that need treatment to reduce mosquito activity. To report a dead bird, call the California State hotline at 1-877-WNV-BIRD or report it online at Birds of particular interest are crows, ravens, magpies, jays and raptors (hawk or eagle).