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.

2016 Monitoring Data

Updated September 19, 2016

Zone 1 Zone 2 Zone 3
Season Week Vector Index Vector Index Vector Index
June 5 - 11 (Week 23) --- --- ---
June 12 - 18 (Week 24) 0.00 0.00 0.00
June 19 - 25 (Week 25) 0.00 0.00 0.00
June 26 – July 2 (Week 26) 0.00 0.00 0.00
July 3 - 9 (Week 27) 0.00 0.00 0.00
July 10 - 16 (Week 28) 0.00 0.20 0.00
July 17 – 23 (Week 29) 0.00 0.36 0.34
July 24 – 30 (Week 30) 0.19 0.00 0.00
July 31 – August 6 (Week 31) 0.00 0.53 0.20
August 7 - 13 (Week 32) 0.41 1.01 0.00
August 14 - 20 (Week 33) 0.00 0.71 0.18
August 21 - 27 (Week 34) 0.20 0.20 0.17
August 28 - September 3 (Week 35) --- --- ---
September 4 - 10 (Week 36) --- --- ---
September 11 - 17 (Week 37) --- --- ---

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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