A mosquito in Los Angeles County has tested positive for dengue, the first detection of the virus in an Aedes mosquito in the state, officials said.

The mosquito was found in a surveillance trap in Sun Valley, the Greater Los Angeles County Vector Control District said in a news release.

“The District is working collaboratively with the Los Angeles County Department of Public Health to deploy targeted mosquito control measures aimed at reducing the risk of disease transmission,” the release explained.

At least seven cases of locally acquired dengue, a viral illness that can be fatal, have been reported in L.A. County thus far in 2025, including in Sun Valley, La Puente and North Hollywood.

“Although the risk for widespread dengue virus transmission in Los Angeles County remains low, everyone in the county should take proactive steps to prevent mosquito breeding and mosquito bites,” officials said.

Those steps include:

Pouring out standing water in and near your home at least once per week

Removing unneeded containers that can hold standing water

“Dengue can be prevented, and our most powerful tool is community action,” said Dr. Muntu Davis, Los Angeles County health officer.

For information about being tested for dengue, call the Public Health InfoLine at 833-540-0473.

For information about how to reduce the spread of mosquitoes, visit the GLACVCD website.

For more information regarding mosquito control, residents can contact the Greater Los Angeles County Vector Control District at 562-944-9656, visit GLAmosquito.org or connect on social media: Facebook, X, Instagram, Nextdoor, and YouTube.

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