With growing concerns about mosquito-borne illnesses in the San Gabriel Valley, including West Nile virus and locally acquired dengue cases, the San Gabriel Valley Mosquito and Vector Control District is stepping up its efforts. This week, the district will conduct truck-mounted treatments to control mosquito populations in Covina and West Covina.

The operation in Covina will focus on the area between East Cypress Street and East Wingate Street, east of North Dodsworth Avenue, and west of Glendora Avenue. In West Covina, the targeted area stretches between East Walnut Creek Parkway and East Cortez Street, east of South Dancove Drive, and west of South Citrus Street. The ultra-low treatment, aimed at adult mosquitoes potentially infected with West Nile virus, will take place between midnight and 5 a.m. on Wednesday and Thursday, with Friday, Sept. 27, as an alternate date.

The region is facing increasing concerns over both West Nile virus and dengue fever. While West Nile virus is a familiar threat transmitted by the Culex tarsalis mosquito, the recent cases of locally transmitted dengue in Baldwin Park have highlighted the need for aggressive mosquito control measures. So far in 2024, nine human cases of West Nile virus have been reported statewide, and authorities have detected 36 positive mosquito samples in the San Gabriel Valley alone.

Jason Farned, District Manager of the San Gabriel Valley Mosquito and Vector Control District, emphasized the importance of community action, urging residents to eliminate standing water from their properties and protect themselves from mosquito bites. Mosquitoes breed in stagnant water, so regularly checking and removing water from sources like gutters, storm drains, and unused swimming pools is crucial. Using EPA-approved insect repellents, especially during peak mosquito hours, and wearing long sleeves and pants can help reduce the risk of bites. Keeping windows and doors with intact screens is also essential for keeping mosquitoes out of homes.

West Nile virus can cause mild symptoms such as fever, muscle aches, and fatigue. However, in people over 50 and those with chronic conditions, the virus can lead to severe complications like meningitis, encephalitis, and paralysis. There is no vaccine for West Nile virus, so prevention remains the best defense.

The San Gabriel Valley Mosquito and Vector Control District is one of five vector control districts in Los Angeles County. The agency actively monitors stagnant water sources, such as gutters, storm drains, and non-functional swimming pools, to limit mosquito breeding. As spraying efforts continue in Covina and West Covina, residents are encouraged to take steps to protect their homes and reduce the risks of mosquito-borne diseases.