Four people have been hospitalized with West Nile virus infections in Los Angeles County, marking the first confirmed human cases of the mosquito-borne disease for the 2025 season, health officials announced.

The cases were reported from late July through late August and involve residents of the Antelope Valley, San Fernando Valley and central Los Angeles. All four individuals are recovering.

“The first human cases of West Nile virus are an important reminder that we all need to take steps to prevent mosquito bites and mosquito breeding,” said Dr. Muntu Davis, Los Angeles County health officer. “Mosquitos thrive in hot weather, increasing the risk of bites and mosquito-borne diseases.”

West Nile virus is transmitted through the bite of infected mosquitoes and can cause fever, headache,

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