Los Angeles County health officials Wednesday confirmed the first locally acquired case of the mosquito-borne illness dengue of the 2025 mosquito season.
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The patient is a San Gabriel Valley resident with no history of travel to areas where dengue is endemic. According to the county Department of Public Health, the unidentified person developed symptoms in late September and is recovering.
"While the potential risk for widespread dengue virus transmission in Los Angeles County remains low, this case highlights the presence of infected mosquitoes locally and underscores the importance of preventive measures to control the spread of this virus," health officials said in a statement.
The Department of Public Health reported a total of 14 locally acquired dengue cases last year. Such infections are considered "extremely rare" in a region where the virus had never been previously transmitted by mosquitoes.
The illness is transmitted primarily through the bite of an infected Aedes mosquito. People infected with the virus could develop flu-like symptoms such as fever, headache, muscle pain, rash and mild bleeding. Severe cases can lead to shock and organ impairment requiring immediate medical attention.
"Dengue is preventable, and community action is our strongest defense," Dr. Muntu Davis, Los Angeles County health officer, said in a statement. "Preventing mosquito bites and mosquito breeding is the best way stop local transmission of dengue. People should follow these simple steps to reduce their exposure to mosquitoes and risk for mosquito bites: 1) Use insect repellent on you and your family; 2) Remove items that hold standing water around your home where mosquitoes can lay eggs and breed; and 3) Use, install, or repair window and door screens to prevent mosquitoes from entering your home."
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