SACRAMENTO—Mosquito experts are urging California residents to take precautions against mosquito bites and diseases like West Nile virus and dengue, which have seen a rise in local cases. In 2024, California recorded 18 locally acquired dengue infections, and with ongoing outbreaks in Latin America, this number may rise.
California Mosquito Experts Warn of West Nile Virus and Dengue Threats as Weather Warms Mosquito Awareness Week, observed April 13-19, 2025, aims to educate residents about preventing mosquito-borne diseases.
Dengue spreads through invasive Aedes mosquitoes, now established in 24 counties in California. These mosquitoes are difficult to control and threaten public health by transmitting diseases such as dengue, Zika, and chikungunya. President of the Mosquito and Vector Control Association of California, Stephen Abshier, states, "With locally acquired dengue now a reality in our state, we are doing everything we can to limit its spread." He advises residents to eliminate standing water around their homes and use EPA-registered repellents while outdoors.
The CDC suggests using EPA-registered repellents not only during travel to areas with dengue or similar diseases but also for three weeks after returning home to prevent the spread of the disease to local mosquito populations.
West Nile virus, primarily spread by Culex mosquitoes, remains a significant concern in California. In 2023, the state reported 433 cases, resulting in 20 fatalities, though numbers fell in 2024 to 129 cases and 12 deaths. Since its introduction in 2003, over 8,000 cases and nearly 400 deaths attributed to West Nile virus have been documented.
State Senator Dr. Aisha Wahab emphasized the importance of mosquito control in protecting public health. “Public awareness and participation are key to reducing mosquitoes and keeping our communities safe.”
Southern California is facing a potential spike in mosquito populations due to property damage from wildfires, particularly in Altadena and Pacific Palisades. Residents affected by these fires are encouraged to contact local mosquito control agencies for assistance with inspections and control measures.
To help mitigate mosquito populations and reduce the risk of bites:
- Install and maintain screens on windows and doors.
- Eliminate standing water in flowerpots, tires, and trash cans.
- Fix leaks from faucets and sprinklers.
- Keep rain gutters clear.
- Use EPA-registered insect repellents as directed, especially during peak activity at dawn and dusk.
- Report neglected pools and day-biting mosquitoes to local agencies. For more information, visit [MVCAC website](URL_1) or the California Department of Public Health’s webpage on mosquitos and mosquito-borne diseases.
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