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St. Louis Encephalitis Virus Detected in Eastvale Mosquitoes

Post Date:10/03/2019 9:32 AM

Northwest Mosquito and Vector Control District: St. Louis Encephalitis Virus Detected in Eastvale Mosquitoes

Eastvale, CA: St. Louis Encephalitis Virus (SLEV) had been detected in a mosquito sample in the area of Sumner Ave. and Schleisman Rd. in the City of Eastvale. This is the first positive pool for SLEV in northwest-Riverside County in over 15 years.  As of today, there have been no reported human cases of SLEV in Riverside County.

SLEV is similar to West Nile Virus in that it is transmitted to humans by a mosquito bite. Mosquitoes become infected after feeding on birds carrying the virus. Most people will not experience any adverse effects. However, some people will experience flu like symptoms such as fever, headaches and body aches. In rare instances this virus can become fatal. If any of these symptoms become present it is advised to seek medical attention from your health care provider.

Northwest Mosquito and Vector Control District staff will continue to survey the area looking for any potential mosquito breeding sources. We are asking residents to take an active role in reducing mosquito breeding sites. Residents should look around their home and remove any standing water sources. Some potential breeding sources include potted plants, saucers, bird baths, and any other potential water holding containers.

There is no vaccine or treatment at this time for SLEV. The best way to prevent SLEV is mosquito bite prevention. Residents are advised to take mosquito bite prevention measures such as:

  • Avoid outdoor activities during the times of dusk and dawn.
  • Wear long sleeves and pants when outdoors.
  • Wear EPA-approved insect repellents such as DEET, picaridin, IR3535, and oil of lemon eucalyptus according to label instructions.
  • Repair/replace window and door screening.

If residents are experiencing an abundance of mosquitoes, they can report them to Northwest Mosquito and Vector Control District at (951)340-9792. Please visit our website at for more information.


Eric Ballejos

Public Information and Technology Officer

(951) 340-9792


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