Los Angeles County, California, November 21, 2025
Health officials in Los Angeles County have confirmed the first detection of dengue-positive mosquitoes in the area. Found in Sun Valley, these Aedes mosquitoes are linked to seven locally acquired dengue cases reported this year. Though the risk of widespread transmission is currently deemed low, officials are urging residents to take preventive measures to control mosquito populations and reduce the risk of disease transmission. Enhanced mosquito control initiatives and community participation are emphasized to address this alarming public health issue.
Dengue-Positive Mosquitoes Found in Los Angeles County
Los Angeles County, California – In an unprecedented finding, health officials have confirmed the presence of dengue-positive mosquitoes in Los Angeles County. The Greater Los Angeles County Vector Control District detected Aedes mosquitoes carrying the dengue virus in Sun Valley, marking the first instance of such detection in both the county and the state. This development follows the report of seven locally acquired dengue cases throughout Los Angeles County this year, particularly impacting areas like Sun Valley, La Puente, and North Hollywood. Although health officials assess the risk of widespread transmission as low, local residents are encouraged to take preventive measures to help control mosquito populations.
Detection and Immediate Response
The dengue-positive mosquitoes were discovered through traps set in Sun Valley, a community within the San Fernando Valley. In response to this alarming discovery, the Los Angeles County Department of Public Health has ramped up its efforts. This includes enhanced surveillance, increased community outreach, and coordinated mosquito control initiatives. Strategies such as door-to-door inspections and targeted treatments aim to reduce the mosquito population and limit further spread of the virus. Officials emphasize that community participation is crucial in combating dengue transmission.
Empowering Residents with Preventive Measures
Local residents play a vital role in preventing further issues related to mosquito breeding and bites. The following recommendations are encouraged:
- Use effective insect repellent when outdoors.
- Regularly empty standing water in and around their homes at least once a week.
- Remove unnecessary containers that can hold water, where mosquitoes can breed.
For advice on testing for dengue or other inquiries, residents can contact the Public Health InfoLine at 833-540-0473. More information on mosquito control can also be found on the Greater Los Angeles County Vector Control District’s website.
Dengue in California: An Overview
Dengue is a viral infection primarily transmitted to humans through bites from infected Aedes mosquitoes, notably Aedes aegypti. In 2024, California has reported 18 locally transmitted dengue cases spread across Los Angeles, San Bernardino, and San Diego counties. Though dengue is not an endemic disease in the U.S., localized transmission occurs where these mosquitoes thrive. Continuous monitoring and mosquito population control efforts remain a priority for health officials in California.
Frequently Asked Questions (FAQ)
What is dengue?
Dengue is a viral infection transmitted to humans through the bite of infected Aedes mosquitoes. Symptoms can include fever, headache, muscle pain, rash, and mild bleeding.
How is dengue transmitted?
Dengue is transmitted primarily through the bite of Aedes mosquitoes, specifically Aedes aegypti and Aedes albopictus, which become infected when they feed on a person with the dengue virus in their blood.
What are the symptoms of dengue?
Common symptoms of dengue include fever, headache, muscle pain, rash, and mild bleeding. In severe cases, it can lead to more serious health complications.
How can I prevent dengue?
Preventive measures include eliminating standing water around your home to reduce breeding sites for mosquitoes, using EPA-registered insect repellent, and wearing protective clothing to avoid getting bitten.
Is dengue common in California?
While dengue is not endemic to California, locally acquired cases have been recorded, especially in areas populated by Aedes mosquitoes. Health officials are committed to monitoring and controlling these mosquito populations to prevent further transmission.
Key Features of Dengue in Los Angeles County
| Feature | Details |
|---|---|
| Location | Los Angeles County, California |
| Detection | Dengue-positive Aedes mosquitoes found in Sun Valley |
| Reported Cases | Seven locally acquired dengue cases in 2025 |
| Preventive Measures | Eliminate standing water, use insect repellent, remove containers that can hold water |
| Health Advisory | Public Health InfoLine at 833-540-0473 for testing information |
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