Mosquitos infected with West Nile virus found in Weld, Boulder, Adams, Delta and Mesa counties

West Nile virus is on the rise in Northern Colorado.

Weld, Boulder, Adams, Delta and Mesa counties have all reported finding Culex mosquitoes infected with the disease, the Larimer County Health Department reported Tuesday.

In June, Boulder County Public Health said mosquitos tested positive at Christensen Park near Kings Ridge Boulevard and Tom Watson Park on 63rd Street.

The City of Fort Collins has yet to detect infected mosquitoes or birds, Larimer County officials said Tuesday.

The disease is transmitted to humans by mosquitoes and symptoms may appear in 3 to14 days after infection, according to the Weld County Health Department. 

Initial symptoms include fever, headache, nausea and vomiting, muscle aches, weakness and rash. Symptoms of severe illness include high fever, stupor, disorientation, coma, tremors, muscle weakness, vision loss, paralysis and even death.

About 75 percent of people who are infected have no symptoms, health officials said. About 25 percent will develop West Nile fever.

State health officials advise people take the "Four Ds" precautions against West Nile virus:

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