Weekly Vector Index

Recommendations to spray for adult mosquitoes are made by the Larimer County Health Department, and are based on data from at least a 5-trap area that has a vector index of 0.75 or higher. The City operates a network of 53 traps providing weekly data on the level of WNV in targeted areas.

WNV vector index levels updated weekly, June 15 through early September.

Last updated: September 8, 2020. Next scheduled update: June, 2021

VECTOR INDEX (map of quadrants):

NW Quadrant: 0.00

NE Quadrant: 0.00

SE Quadrant: 0.00

SW Quadrant: 0.00

Highest Vector Index value for 5-trap (minimum) Floating Zone: 0.00

Floating Zone description: NA

Map of Mosquito Traps

PLEASE NOTE: In order to best target infected mosquitoes, treatment zones are based on current data and are often different, smaller, or may cross quadrants.

Mosquitoes don’t respect quadrant boundaries. Vector index values for quadrants are provided to help residents understand a consistent measure of risk throughout the season and over time.

While the vector index for an entire quadrant may be less than 0.75, it is very possible that areas of smaller or different geographical makeup exceed 0.75. Any area of 5 traps or more may become a treatment area regardless of how or where it fits into the quadrants.

When determining treatment areas, the goals are as follows:

Be effective, responsible, and judicious with pesticides

Target as small an area as possible

Target as early as is reasonable to limit viral amplification

Treatment areas must be at least 5 traps in size to be statistically valid

Interested in how the Vector Index is calculated? Find more information from the Centers of Disease Control here.

TRAP REPORTS

Most recent three week's trap data: