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West Nile Virus Found for the Second Time in Mosquitos Trapped in Inyo County

mosquito west nile virus inyo county

West Nile Virus Found for the Second Time in Mosquitos Trapped in Inyo County 

The Owens Valley Mosquito Abatement Program (OVMAP) confirmed today that additional  mosquito samples caught during trapping operations early this week tested positive for West  Nile Virus. This is the second positive sample for West Nile Virus in Inyo County this year. Prior  to that, West Nile Virus had been detected in the Owens Valley occasionally since first being  discovered in our area in 2004. During that time, no human infections were reported, but three horses died after being infected with West Nile Virus. OVMAP also detected St. Louis  Encephalitis this year for the first time in the history of the program. With both diseases being  detected more frequently, as well as them being disbursed over a large geographic area in the  Owens Valley, it is imperative for residents and visitors to ensure they are taking precautions to  avoid being bitten.

“For every 100 people who are bitten by a West Nile Virus-carrying mosquito, only 20 are at risk  of developing symptoms, and of those, fewer than 1% are likely to experience life-threatening  reactions” said Inyo County Health Officer, Dr. James Richardson. Nevertheless, the public is  urged to take precautions discussed below:

  • Using mosquito repellent. The Environmental Protection Agency (EPA) recommends using insect repellents containing DEET, Picaridin, or IR3535. Some oil of Lemon eucalyptus and Para-Menthane-Diol products provide similar protection.
  • Avoiding outdoor activities if possible during dawn and dusk. This is especially important during the first two hours following sunset, when species that spread West Nile Virus are actively biting.
  • Wearing long sleeves and pants. This provides additional protection when used in conjunction with insect repellent.

Likewise, while horses are more at risk for contracting the disease, vaccines are available and  horse owners are urged to get their horses vaccinated. For more information, please contact  your veterinarian.

The positive sample was collected while conducting surveillance activities in areas from  Tinemaha Reservoir south to Olancha. The trap that caught the positive result was in the  Blackrock area according to OVMAP Manager Rob Miller. This area will be heavily treated with  an adulticide application following trapping activities due to high adult mosquito populations in  the area.

About 20% of those who are bit by an infected mosquito will experience flu-like symptoms that  last a few days and resolve on their own. Over-the-counter pain medications can help reduce  fever and relieve some of the symptoms. About 1 out of every 150 people who contract West  Nile Virus will develop more serious neurologic illness. If you develop symptoms of severe WNV  illness, such as unusually severe headaches or confusion, seek medical attention immediately.  Pregnant women and nursing mothers are encouraged to seek medical attention if they develop  symptoms commonly associated with WNV.

To find more information on West Nile Virus, visit the Centers for Disease Control WNV page at  https://www.cdc.gov/westnile/index.html, or the California West Nile Virus website at  http://www.westnile.ca.gov/.

Please report mosquito problems to the Owens Valley Mosquito Abatement Program by calling:  (760) 873-7853.

Click here to read more on West Nile Virus in Inyo County.

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