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County Vector Control warns of rising travel-related dengue, outlines sterile-insect pilot near Aliso Viejo
Summary
A county Vector Control representative told the Aliso Viejo City Council the district expects higher travel-related dengue cases in 2025 and described a sterile-insect (SIT) pilot in nearby Mission Viejo covering roughly 800 homes; the district asked cities to amplify outreach and partner on surveillance and education.
A representative from the county Vector Control special district briefed the Aliso Viejo City Council on mosquito surveillance and disease trends, saying the district serves about 3,200,000 county residents and that West Nile virus remains endemic.
“Last year we had about 53 positive mosquitoes and one human infection in Huntington Beach,” the presenter told the council, and said the district investigated 57 travel-related dengue cases in 2024 compared with 24 in 2023. The presenter said staff anticipate more than 80 travel-related dengue cases in 2025 as travel increases and Aedes mosquitoes become established in the region.
The presenter described a sterile-insect technique (SIT) pilot in Mission Viejo — a neighboring jurisdiction — that aims to release irradiated, sterilized male mosquitoes to reduce future populations. The pilot covers an estimated 800 homes in a five-year trial; the district said it is in year three and will complete additional releases and competitiveness tests in coming seasons.
Why it matters: Aedes mosquitoes bite aggressively during the day and can transmit dengue; the district emphasized its public-health role and urged local governments to help with outreach. The presenter said the SIT approach has worked elsewhere and offers a pesticide-free option that does not create insecticide resistance.
Council response and follow-up: Council members thanked the presenters and asked about local outreach and trustee representation on the district board. The presenter asked cities to include the district in resident newsletters, invite the district to community events and defer resident inquiries to district staff when appropriate. The presenter also noted that jurisdictions will be notified before any public signage is posted.
Next steps: The council received the presentation and did not take formal action. Staff said they would coordinate outreach with Vector Control and make contact information available to residents.
