HomeMy WebLinkAboutMemo - Mail Packet - 8/16/2022 - Memorandum From Matt Parker And Amy Resseguie Re: West Nile Virus (Wnv) Week 31 Update 1745 Hoffman Mill Road
PO Box 580, Fort Collins, CO 80522-0580
MEMORANDUM
Date: August 11, 2022
To: Mayor and City Councilmembers
From: Matt Parker, Sr. Supervisor, Natural Areas
Amy Resseguie, Lead Specialist, Communications & Public Involvement
Through: Kelly DiMartino, City Manager
Tyler Marr, Interim Deputy City Manager
Seve Ghose, Director, Community Services
Mike Calhoon, Director, Parks
Katie Donahue, Director, Natural Areas
Ginny Sawyer, Sr. Project Manager
Subject: West Nile virus (WNV) – Week 31 Update
Summary:
The adult mosquito spray of July 31 and August 3 seemingly slowed the amplification of WNV.
Although more traps are testing positive, the reduced abundance is keeping the Vector Index
lower. This week’s data shows a 5-trap area with a vector index value of 0.66, below the City’s
threshold of 0.75.
Current Vector Index:
Week No: 31 Vector Index
Threshold:
Previous Week Vector
Index:
Current Vector
Index:
FC – Zone NW NA 0.00 0.00
FC – Zone NE NA 0.19 0.00
FC – Zone SE NA 0.11 0.27
FC – Zone SW NA 0.00 0.18
FC – Citywide NA 0.48 0.15
Floating Zone 0.75 0.48 0.66
Current Conditions: Five of seven traps detected WNV-positive mosquitoes, all in a band
between Horsetooth Rd. and Harmony Rd., and Taft Hill Rd. and Ziegler Rd. However, the
abundance of mosquitoes and their infection rates do not calculate to a value sufficient to
exceed the City’s treatment threshold.
DocuSign Envelope ID: B159B9FC-6584-467A-A417-9C4EEA84E3DE
City of Fort Collins
Ample monsoonal precipitation, coupled with high daytime and overnight temperatures,
continues to drive mosquito abundance. The data currently show both abundance and infection
rate at or near historic averages
Process for Spray Recommendations: Current WNV conditions do not exceed the policy
thresholds identified for adult mosquito spraying applications. However, when the City’s trapping
network shows WNV activity beyond the threshold of 0.75, the LCDHE makes a
recommendation that the City conduct an application to treat adult mosquitoes. When 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:
Public outreach is underway including social media posts, utility bill inserts and other
advertising. Outreach information is centered on “4Ds” messaging, which encourages people to
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.
###
DocuSign Envelope ID: B159B9FC-6584-467A-A417-9C4EEA84E3DE