mosquito larvae 

Mosquito Monitoring for West Nile Virus

Vector Index Log

The vector index tell us the relative risk of West Nile virus transmission. The vector index is based on the:

  • Total number of Culex Pipien and Culex Tarsalis – the species that carry West Nile virus
  • Number of infected mosquitoes across an area

We calculate the vector index by determining the average number of infected mosquitoes collected per trap in an area. Emergency spraying may be recommended when the vector index is at 0.75 or higher.

2015 Monitoring Data

Updated July 24, 2015

Zone 1 Zone 2 Zone 3
Season Week Vector Index Vector Index Vector Index
May 31 - June 6 --- --- ---
June 7 - 13 0.00 0.00 0.00
June 14 - 20 0.00 0.00 0.00
June 21 – 27 0.00 0.00 0.00
June 28 – July 4 0.00 0.00 0.00
July 5 – 11 0.00 0.00 0.00
July 12 – 18 0.14 0.00 0.00
July 19 – 25 Pending 0.00 0.00
July 26 – August 1
August 2 – 8
August 9 - 15


August 16 - 22


August 23 - 29
August 30 - September 5
September 6 - 12
September 13 - 19

NOTE: "---" indicates a single pool was submitted for that zone that tested positive, therefore we were unable to calculate an infection rate or vector index for that zone.

Sentinel Map

sentinel map for mosquito monitoring

Monthly Report

OtterTail Environmental offers monthly updates on mosquito monitoring in Boulder County.

West Nile Data

 Related Links


Contacts

Vector Control Program

303-441-1564
Submit a question

www.BoulderCountyVector.org

Boulder

3450 Broadway
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