With one case of West Nile virus found in Larimer County this year, annual weekly mosquito testing begins this week throughout the state.
A Loveland resident was in May, according to the state Department of Health and Environment.
West Nile cases in May are rare, the department said.
The number of infected mosquitoes in the population is the best predictor of the level of West Nile risk in an area.
Many counties and municipalities throughout the state conduct weekly mosquito surveillance for the virus every year. Adult mosquitoes captured in traps are tested to obtain an estimate of how many infected mosquitoes might be flying around. Local public health officials notify the public of the risk.
“Whenever the virus is present anywhere in the state, people are at risk,” said state public health veterinarian Jennifer House. “Conscientiously protecting yourself — emptying water from pots and puddles, putting on long sleeves and repellent, choosing when to stay indoors — are actions you can take to avoid mosquito-borne illnesses.”
Last year, there were 101 cases of West Nile virus in Colorado, including three deaths. About 20 percent of people who become infected have flu-like symptoms, and less than 1 percent develop a more serious illness that can be deadly. People who experience severe headaches or confusion should see a health care provider right away.
