Vector Control warns of dengue and West Nile risk; district outlines sterile-insect program

Representatives of the Greater Los Angeles County Vector Control District told the City Council the county is seeing continued West Nile virus risk and the emergence of dengue in Southern California and described steps residents and the city can take to reduce disease risk.

Councilman Jim Dear, who also serves as a trustee for the vector district, opened the presentation by noting a recent Carson resident death linked to West Nile virus and asked the district to describe services available to residents. "The West Nile virus is a serious threat to the health of people in LA County," Dear said.

David Phelan (listed in the presentation materials as communications manager) gave the district briefing. He outlined three core district functions — surveillance, control and education — and described field programs that include residential inspections, treatment of storm drains and a pool-inspection program. Phelan said the district conducts about 4,500 inspections in Carson annually and manages underground storm-drain treatment and other low-visibility activities.

Phelan described an emerging tool called sterile insect technique, or SIT, that the district uses against invasive Aedes mosquitoes. "We x-ray sterilize the male mosquitoes," Phelan said. "Once they mate with female mosquitoes, their eggs are nonviable." He said SIT is a nonchemical, environmentally focused approach intended to reduce the population without generating insecticide resistance.

Council members asked practical questions about control strategies and public outreach. Mayor Pro Tem Cedric Hicks asked what a "midge" is; Phelan described midges as nonbiting nuisance flies. The district also emphasized repellents recommended by the U.S. Environmental Protection Agency — DEET, picaridin and oil of lemon eucalyptus — and offered to attend local events and provide educational materials. Phelan said the district would try to have a presence at the October 4 jazz festival and the October 19 women's health conference.

Why this matters: The district's update signals growing local exposure to mosquito-borne disease and presents a set of nonchemical and inspection-based tools the city can use to limit breeding sites and human exposure.

What’s next: District staff provided materials and a link to the presentation; the council encouraged broader public outreach and invited the district to participate in upcoming city events.