Yellow Fever Mosquitoes Found in Davis County
An invasive Aedes aegypti mosquito, commonly called the yellow fever mosquito, was discovered at Bicentennial Park in Clearfield on Oct. 8 during routine mosquito surveillance, Davis County Health Department officials announced. The finding marks the first time that the species has been found in Davis County, expanding its known range northward after years of documented presence in southern Utah.
Surveillance and Containment Efforts in Clearfield
Following the detection at Bicentennial Park, the Mosquito Abatement District-Davis deployed additional traps and initiated neighborhood checks. Greg White, manager of the Mosquito Abatement District-Davis, stated that no more invasive Aedes aegypti mosquitoes had been found at this time. Workers will continue extra trapping and treatments until colder weather arrives to suppress the local population while it remains small.
Aedes Aegypti Mosquitoes Transmit Viruses by Biting Humans
Native to Egypt, the Aedes aegypti mosquito is a recognized vector for several viruses, including dengue, Zika, and yellow fever, according to the European Centre for Disease Prevention and Control. Unlike other mosquito species, these insects prefer to feed on humans, bite during daylight hours rather than at dusk or dawn, and typically target areas near the ankles. They lay eggs in small amounts of standing water, such as planters, buckets, and unused containers.
Brian Hatch, director of the Davis County Health Department, noted that while related illnesses are currently tied primarily to travel, the establishment of the vector locally increases the possibility of domestic transmission. The Centers for Disease Control and Prevention reported in 2024 that areas hosting these mosquitoes do not inherently face a higher overall disease risk, but the species’ preference for human hosts makes it more likely to spread these viruses than other types of mosquitoes.
Davis County Health Department Prevention Guidance
Health officials recommend that residents adopt specific protective measures to reduce bite exposure and eliminate breeding sites:
- Apply insect repellent containing DEET or another EPA-registered repellent.
- Wear light-colored, loose-fitting long sleeves and long pants outdoors.
- Drain all standing water from yards, regardless of size.
- Clear debris from roof gutters to prevent moisture accumulation.
- Inspect window and door screens to ensure they remain in good condition.
- Maintain short grass and cut weeds around properties.
Residents who spot small, dark mosquitoes biting during daylight hours are instructed to contact the Mosquito Abatement District-Davis at 801-544-3736.
Frequently Asked Questions About the Davis County Detection
How did the Aedes aegypti mosquito arrive in Davis County?
The exact introduction route remains unclear. While the species has been routinely tracked in southern Utah since 2019, health officials have not determined how it transported to northern Utah.
Are there currently any local cases of mosquito-borne diseases in Davis County?
Public health authorities emphasize that infections diagnosed in Utah residents have historically been linked to travel.
How far do yellow fever mosquitoes typically travel?
The species generally does not fly far. It thrives in warm climates and tends to stay close to human habitations where it feeds and breeds in small water receptacles.
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