The most recent reading in Berthoud indicated a vector index of 3.0, far higher than the 0.5 index that strongly predicts cases of West Nile in humans and the 1.0 index that is “clearly correlated with human cases,” according to the release. Officials monitor the mosquitoes in the area in traps, looking for the type that can carry the virus.

“We have communicated with Town leadership and are urging that they spray affected areas immediately to prevent human cases of the virus, which can be very serious for some people.” “We are seeing unprecedented levels of mosquitoes in Berthoud that can carry West Nile virus,” Tom Gonzales, Larimer County’s public health director, said in the release. The health department “has notified town leadership to recommend immediate spraying of affected areas and urges all residents and visitors to take extra precautions to prevent mosquito bites,” according to a Sunday release from Larimer County. Berthoud will hold a special meeting Tuesday to decide whether to spray for adult mosquitoes after the Larimer County Department of Health warned that there is “an unusually high abundance” of the type of mosquitoes that can carry West Nile virus in town.

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