LONGMONT, Colo. (AP) -- Health officials are urging residents to be cautious after the West Nile virus was detected in mosquitoes in Boulder County.
Dan Wolford, Longmont's parks, open space and greenways manager, says the virus-carrying insects came from a pool of mosquitoes from five of the 11 locations that are sampled in the city each Sunday.
The Longmont Times-Call reports (http://bit.ly/1c62ksn ) that so far this year, mosquito pools in two other Colorado counties -- Larimer and Mesa -- have tested positive for the virus.
Human infections can occur without symptoms or can cause mild or severe illness, fever and aches. Infections can also lead to chronic disability and even death.
Health officials encourage people to wear insect repellent, drain standing water and limit outdoor activities at dusk and dawn when mosquitoes are most active.