Health officials are warning residents and visitors that the risk of West Nile virus is currently very high across Larimer County, and they are urging everyone to take steps now to protect themselves from mosquito bites.

Mosquito trap data show that the vector index, which is a measure of how many mosquitoes are carrying West Nile virus, is over 1.0 in several areas of the county. That level is considered very high and signals a serious risk to public health.

“When the vector index tops 1.0, it tells us that many mosquitoes in our area are infected,” said Tom Gonzales, Public Health Director for the Larimer County Department of Health and Environment. West Nile virus can lead to serious illness, but the good news is that prevention is simple and effective.”

West Nile virus spreads through the bite of an infected mosquito. Adults 55 and older, and those with conditions like cancer, diabetes, high blood pressure, or weakened immune systems, are more likely to develop serious symptoms. These can include tremors, numbness, vision loss, or even paralysis.

Even if you don’t get bitten by mosquitoes often, LCDHE recommends taking these simple steps:

Use an effective EPA-registered repellent.

Wear long-sleeved shirts and pants when outdoors, especially during gardening, walking, or other outdoor activities.

Avoid outdoor activities at dawn and dusk, when mosquitoes are most active.

The Health Department tracks West Nile virus through partnerships with local municipalities, a mosquito control contractor, and Colorado State University. LCDHE monitors the vector index and makes recommendations to municipalities for mosquito control efforts, such as spraying for adult mosquitoes.

To learn more about West Nile virus and how to protect yourself, visit: www.larimer.gov/westnile