HomeMy WebLinkAboutMemo - Mail Packet - 8/3/2021 - Memorandum From Matt Parker, Amy Resseguie And Tyler Marr Re: West Nile Virus (Wnv) - Weekly Update 1745 Hoffman Mill Road
PO Box 580, Fort Collins, CO 80522-0580
MEMORANDUM
Date: July 28, 2021
To: Mayor and City Councilmembers
From: Matt Parker, Sr. Supervisor, Natural Areas
Amy Resseguie, Sr. Specialist, Communications & Public Involvement
Tyler Marr, Deputy Director, Information & Employee Services
Through: Darin Atteberry, City Manager
Kelly DiMartino, Deputy City Manager
Seve Ghose, Director, Community Services
Mike Calhoon, Director, Parks
Zoe Shark, Interim Director, Natural Areas
Subject: West Nile virus (WNV) Weekly Update
Summary:
-positive
Mosquito abundance and infection rate (calculated as the Vector Index) remain below the
threshold for adult mosquito spraying. Data indicates that the abundance of WNV-transmitting
Culex species remains at approximately double the annual average for this week.
Current Vector Index:
Week No: 29 Vector Index
Threshold:
Previous Week Vector
Index:
Current Vector
Index:
FC Zone
NW NA 0.00 0.00
FC Zone NE NA 0.00 0.00
FC Zone SE NA 0.09 0.14
FC Zone SW NA 0.00 0.00
FC Citywide NA 0.00 0.03
Floating Zone 0.75 0.37 0.41
Current Conditions: Two traps detected WNV-positive mosquitoes, both in the southeastern
quadrant of the city. This is the second consecutive week two traps in the southeast have tested
positive. A floating zone consisting of the 5 nearest traps indicates a vector index value of 0.41.
This area is bound by Timberline Rd., Harmony Rd., I-25, and Carpenter Rd. Exceptionally hot
and dry periods, interrupted by occasional rainfall events, have allowed Culex mosquitoes to
thrive. Vector index values are slightly below average for this point in the summer, however
City of Fort Collins
Culex mosquito abundance is exceeds the average two-fold. The Vector Index calculation is the
product of mosquito abundance and mosquito infection rate.
Process for Spray Recommendations: Current WNV conditions are below the policy thresholds
activity beyond the threshold of 0.75, the Larimer County Health Department will likely make a
recommendation that the City conduct an application to treat adult mosquitoes. If an application
is recommended, areas of concern will be identified based on data from a minimum of 5 traps.
Identified treatment areas may be sub-zone or may cross zone boundaries.
Outreach and Public Awareness:
Budget reductions have impacted the WNV outreach effort eliminating poster/rack card printing,
print and radio ads, bus bench ads, and community events booths. Street banners, social
media, and other digital content will continue as planned. In the event of a localized spike in the
vector index value, door hangers will be distributed. Outreach materials and messaging are
shared in both English and Spanish.
Drain
standing water, Dress in long pants and sleeves to deter biting, Defend with EPA-approved
repellant, and avoid the high mosquito activity time between Dusk & Dawn.
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