mosquito larvae 

Mosquito Monitoring for West Nile Virus

Monthly Report

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

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.

2014 Monitoring Data

Updated July 28

Zone 1 Zone 2 Zone 3
Season Week Vector Index Vector Index Vector Index
May 18 - 24 --- --- ---
May 25 - 31 --- --- ---
June 1 - 7 --- --- ---
June 8 – 14 0.00 0.00 0.00
June 15 – 21 0.00 0.11 0.00
June 22 – 28 0.00 0.00 0.00
June 29 – July 5 0.00 0.00 0.00
July 6 – July 12 0.00 0.91 0.00
July 13 – July 19 0.00 0.18 0.47
July 20 – July 26 Pending 0.22 0.00
July 27 - August 2
August 3 - 9
August 10 - 16
August 17 - 23
August 24 - 30
August 31 - September 6

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

West Nile Data

 Related Links


Contacts

Vector Control Program

303-441-1564
Submit a question

www.BoulderCountyVector.org

Boulder

3450 Broadway
Map & Directions

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