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The Los Angeles County Department of Public Health is investigating a new case of locally acquired dengue in a resident of El Monte. The person had no history of travel to areas where dengue is endemic. This case of local transmission does not appear to be related to the cases previously reported by Public Health and is the fifth case of locally acquired dengue reported in LA County this year. LA County is seeing an emergence of locally acquired dengue that is extremely rare for a region where the virus has not previously been transmitted by mosquitoes.
It can take 4-7 days for a person to develop symptoms after being bitten by a mosquito infected with dengue. Persons infected with dengue may have flu-like symptoms including high fever, severe headache, pain behind the eyes, joint and muscle pain, rash, and mild bleeding. Severe dengue can result in shock, severe bleeding and severe organ impairment which require immediate medical attention. Residents who have symptoms of dengue should see their healthcare provider. A blood test is the only way to confirm dengue infection.
Public Health urges healthcare providers to consider dengue in patients with acute febrile illness and test for and report suspect cases of mosquito-borne diseases. Providers should also routinely discuss mosquito bite prevention with patients and travelers.
Everyone in LA County can take proactive steps to reduce mosquito breeding, avoid mosquito bites, and prevent the ongoing local transmission of dengue. This includes:
Public Health’s first confirmed case of locally acquired dengue was reported Sept. 9. Cases of locally acquired dengue were previously confirmed by Long Beach and Pasadena in fall 2023.
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