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Mosquitoes Test Positive for West Nile Virus in Larimer County (Aug. 2020)

Mosquitoes with West Nile virus have been found in northeast and southeast Fort Collins, Loveland, and Berthoud. Mosquito numbers are rising in many areas of the county. It's a good time to remind people to protect themselves from West Nile virus by taking steps to avoid being bitten, including using an effective repellent or staying indoors when mosquitoes are biting.

West Nile disease is a viral infection which is spread to people by bites from infected mosquitoes. Symptoms can range from none at all to severe illness. About 75 percent of people who are infected don't have symptoms; about 25 percent will develop West Nile fever. Less than 1 percent develop the more severe neuroinvasive form, which can lead to hospitalization, critical illness, chronic disability, or even death.

Larimer County Department of Health and Environment works with our cities, a mosquito abatement company (Vector Disease Control International, formerly Colorado Mosquito Control), and Colorado State University to monitor and assess the risk to Larimer County residents.

West Nile virus can be prevented. In addition to community mitigation efforts, such as larviciding, reducing water where mosquitoes can breed, and spraying for adult mosquitoes, individuals can remember to use the 4 Ds to help prevent West Nile virus disease:
  • Defend - Use DEET or other effective mosquito repellent. Use an EPA-registered mosquito repellent that has been proven to be effective against mosquitoes that carry West Nile virus.
  • Dusk to Dawn - Avoid exposure during peak mosquito feeding times, from dusk through dawn.
  • Dress - Wear long sleeves and pants to keep mosquitoes from biting you.
  • Drain - Remove standing water in your yard or garden to minimize mosquito breeding areas.
  • For more tips on what you can do to prevent West Nile virus, visit larimer.org/westnile.
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