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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 > West Nile Virus threat


Traditional Outdoor Activities for the 4th of July Weekend Are Cause to Remember Precautions

This 4th of July weekend, while out enjoying the holiday, Boulder County Public Health officials would like to remind residents that West Nile virus (WNV) is still a very real threat, and they should take action to protect themselves. The recent wet weather, followed by hot temperatures has created the right conditions for mosquito breeding. Boulder County is seeing a rise in the Culex mosquito population, which is known to carry and transmit the virus.

Boulder County has reported no human cases, and no positive horses, mosquito pools, or birds. Statewide, Colorado has reported the first two human cases of the year; a 50 year-old female from Weld County and a 17 year-old male from Ft. Collins. Additionally only 1 positive bird and no positive mosquito pools or horse cases have been reported.

Across the U.S, one human death has been reported from Missouri and two other human cases have has been reported from Kansas and California. California and Arizona are the most active states with numerous counties reporting positive birds, sentinel chickens and mosquito pools.

Whether it’s a back yard barbeque or watching the fireworks, remember to protect yourself and your family by practicing each of the 4 Ds:

  • Use DEET-enhanced insect repellent or alternative.
  • The DEET alternatives listed below have been shown to have the same efficacy as a low concentration of DEET, lasting about 90 minutes. Please follow the manufacturer's instructions provided on the product label.
    • Bite Blocker (key ingredient: soybean oil).
    • Picaridin, found in Cutter Advanced. This product has not yet been approved for children under 3. Picaridin, also known as KBR 3023, has been available for many years in Asia, Australia, and Europe. It was recently approved for use in mosquito sprays by the EPA and has been included in the list of repellent recommendations by the Center for Disease Control.
    • Oil of lemon eucalyptus, found in Repel Lemon Eucalyptus, OFF! Botanicals & Fight Bite Plant-Based Insect Repellent. These products should not be used on children under 3. Repel is 30% eucalyptus oil. Pure eucalyptus oil should never be applied to skin.
  • DRESS in long sleeves and pants.
  • Avoid the outdoors between DUSK AND DAWN.
  • DRAIN standing water.

Top of Page

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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