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Boulder County
Public Health

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Boulder, CO 80304
(303) 441-1100

You are here: Health Home > Communicable Disease Control > West Nile Virus > News > 1st Positive Mosquito


1st Positive Mosquito for West Nile

June 23rd - The Larimer County Department of Health and Environment reported on Tuesday, June 22, that a mosquito has tested positive for West Nile virus. The mosquito (a Culex tarsalis) was trapped on June 8 and tested by the Centers for Disease Control and Prevention (CDC). The location of the mosquito trap was in Fort Collins.

There have been no positive mosquitoes detected in Boulder County to date, as well as no positive bird, horse, or animal cases. The positive test in Larimer County is the first positive mosquito pool in Colorado. According to Dr. Adrienne LeBailly, M.D., Larimer County Health Department Director, "We now have confirmation that the West Nile virus is present in the county, which is really not a surprise."

The positive mosquito is a reminder that individuals need to protect themselves by remembering the 4 Ds:

Use DEET or alternative.

DRESS in long sleeves and pants.

Avoid DUSK until DAWN.

DRAIN standing water.

Please visit the maps on this site to find out about mosquito trapping in Boulder County. 

For questions about West Nile virus not answered on this site, please call our hotline at 303-441-1460 or e-mail cgoussetis@bouldercounty.org with your questions.

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Prevention
  1. Use DEET or alternative.
  2. DRESS in long sleeves and pants.
  3. Avoid DUSK until DAWN.
  4. DRAIN standing water. 
Resources
  1. Pesticide Info

  2. Current WNV Activity

  3. Educational Materials

  4. Boulder County WNV Response Plan

Contact Us

West Nile Virus Hotline
 1-877-462-2911

Boulder County Hotline
303-441-1460

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