Mosquitoes collected from the unincorporated area of Nuevo tested positive for West Nile virus, Riverside County officials have confirmed.

The Riverside County Department of Environmental Health received confirmation July 30 from the Coachella Valley Mosquito and Vector Control testing lab that mosquitoes collected in the Nuevo location tested positive. The samples were collected on July 21 from the Reservoir Avenue and Orange Street area, near Mystic Field.

It is not unusual for mosquitoes in parts of Riverside County to test positive for the virus, especially during the Summer. In 2019, 3 samples out of 655 tested positive for the virus.

The virus can be transmitted to humans and some animals through the bite of an infected mosquito. Most individuals who are infected will not experience any illness. Others will have only mild symptoms, such as fever, headache and body aches. However, young children, the elderly or individuals with lowered immune systems are at greater risk of more severe symptoms. Anyone with symptoms should contact their health care provider.

The Department’s vector-control staff has intensified insect surveillance, as well as efforts to control adult and larval mosquitoes in this area to reduce the bug populations and interrupt the disease transmission cycle. Residents are encouraged to take an active role to reduce the threat of West Nile virus in their neighborhoods.

  • Protect yourself against insect bites by using insect repellent. Use a repellent with DEET (N, N-diethyl-m-toluamide), picaridin (KBR 3023), oil of lemon eucalyptus [p-methane 3, 8-diol (PMD)] or IR3535 according to the instructions on the product label. DEET products should not be used on infants under two months of age and should be used in concentrations of 30 percent or less on older children. Lemon eucalyptus oil should not be used on children under three years of age.
  • Be aware of peak insect hours. Dawn and dusk are peak biting times for many bugs, Consider rescheduling outdoor activities during that time.  Report any day biting mosquitoes to vector staff, stressing that you are being bitten during the day verses at dawn or dusk.
  • Clothing can help reduce insect bites. Wear long-sleeves, long pants, and socks when outdoors to help keep mosquitoes away from skin.
  • Mosquito-proof your home. Drain standing water because mosquitoes lay their eggs in standing water. Limit the number of places for mosquitoes to breed by draining/discarding items that hold water. Check rain gutters and drains. Empty unused flowerpots and wading pools. Change water in birdbaths and pet bowls at least weekly.
  • Keep mosquitoes outside by having tightly fitting screens on all windows and doors.

Contact the Riverside County Vector Control program at (951) 766-9454 or your local vector-control district to report mosquito problems, request mosquito fish and report neglected pools or standing water as potential mosquito sources. Visit the department online at to obtain more information.

Image Sources

  • West Nile Test: Shutterstock