HomeMy WebLinkAboutMemo - Mail Packet - 09/24/2024 - Memorandum from Ryan Vincent re West Nile Virus (WNV) Weekly UpdateNatural Areas Department
1745 Hoffman Mill Road
PO Box 580, Fort Collins, CO 80522
970-416-2493
rvincent@fcgov.com
CC: Dean Klingner, Community Services Director; Mike Calhoon, Parks Director; Katie Donahue, Natural Areas
Director; Matt Parker, Natural Areas Ecological Stewardship Manager
MEMORANDUM
Date: September 17, 2024
To: Mayor and City Councilmembers
Through: Kelly DiMartino, City Manager
Tyler Marr, Deputy City Manager
From: Ryan Vincent, Natural Areas Sr. Supervisor
Subject: West Nile Virus (WNV) – Weekly Update
BOTTOM LINE
• Based on this week’s data, the Larimer County Department of Health and
Environment (LCDHE) does not recommend spraying for adult mosquitos.
• As overnight temperatures drop to the low 50s, mosquitoes reduce breeding and
prepare for winter, lowering the risk of WNV.
• WNV surveillance and mitigation efforts, which took place between June 2 and Sept. 13,
have now concluded for the season.
BACKGROUND
Current Vector Index Information
Week 37 of 37 VI Threshold: Previous Week VI: Current VI:
FC – Zone NW NA 0.06 0.05
FC – Zone NE NA 0.15 0.07
FC – Zone SE NA 0.09 0.00
FC – Zone SW NA 0.00 0.00
FC – Citywide NA 0.09 0.03
Floating Zone 0.75 0.42 0.21
Docusign Envelope ID: 6416D1B1-2C9F-4AE1-B9FA-D256057C4137
BACKGROUND CONTINUED
• Two traps detected WNV this week (one in NE, one in NW), down from five last week.
• The 6-trap floating zone with the highest vector index (0.21) was located between
Laporte Avenue and Prospect Road, and between Taft Hill Road and Timberline Road.
• Current mosquito abundance, WNV infection rates, and Citywide vector index is
consistent with historical averages for this time of year.
• As of Sept. 11, the Colorado Department of Public Health and Environment reported 48
WNV cases, which includes 2 deaths, 24 cases with neurologic symptoms, and 16
hospitalizations. LCDHE reported 5 of these cases.
NEXT STEPS
Staff will provide a memo summarizing the 2024 WNV season and outlining upcoming off-
season planning efforts.
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Docusign Envelope ID: 6416D1B1-2C9F-4AE1-B9FA-D256057C4137