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West Nile Virus
MosquitoWest Nile Virus is carried by certain birds and transmitted to people by bites from mosquitoes that have fed on infected birds. Female Culex mosquitoes, the species that transmits the virus, usually start emerging in late April or early May and continue transmitting the virus until the first frost, which usually is in September along the Front Range.

West Nile Virus disease is rare, but if you have symptoms including high fever, severe headache and stiff neck, contact your health care provider immediately.



Practice the “Four Ds” and Fight the Bite
  1. Drain standing water around the house weekly since that’s where mosquitoes lay eggs.  Be sure to empty old tires, cans, flowerpots, clogged rain gutters, rain barrels and toys where puddles can occur.
  2. Dusk and dawn are when mosquitoes that carry the virus are most active, so limit outdoor activities or take precautions to prevent mosquito bites.
  3. DEET is an effective ingredient to look for in insect repellents. Always follow label instructions carefully.
  4. Dress in long sleeves and pants during dawn and dusk or in areas where mosquitoes are active.


Broomfield Public Health and Environment, Health Protection 720.887.2220