HomeMy WebLinkAboutCOUNCIL - AGENDA ITEM - 7/6/2021 - COMMUNITY REPORT: WEST NILE VIRUS UPDATE WITH LARIJuly 6, 2021
West Nile Virus –A Community Report
Tom Gonzales, Larimer County Public Health Director
West Nile Virus Program
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PROGRAM GOAL
Larimer County and the City of Fort Collins collaborate to reduce the risk
of West Nile Virus (WNV) infection while limiting adverse human health
and environmental impacts.
WNV History in Larimer County
WNV came to New York City in 1999, arrived in Larimer County in 2003.
Partners instituted a public health program to focus on breeding area
reduction, larval control, surveillance, and public education.
Application of pesticide for adult mosquito conducted as emergency
response, implemented by the City, at the direction of the County Health
Department
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West Nile Virus Program
Reduce Risk of WNV
Multi-angle approach to management
Limit Adverse Health Impacts
Only use broadcast pesticide when data supports the need
Provide education and repellant
Limit Adverse Environmental Impacts
Targeted larval control
Targeted adult spray applications
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West Nile Virus Trends in Larimer County
WNV History –Recent Trends
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Cases Reported Neuroinvasive Cases (%)Hospitalizations (%)Deaths (%)Median Age (Range)
2016 31 4 (13%)6 (19%)0 (0%)57 (25–76)
2017 14 3 (21%)3 (21%)2 (14%)58 (25-84)
2018 17 7 (41%)6 (35%)0 (0%)44 (10-71)
2019 7 1 (14%)1 (14%)1 (14%)47 (12-80)
2020 3 0 (0%)0 (0%)0 (0%)53 (49-54)
Total 72 15 (21%)16 (22%)3 (4%)51 (10-84)
West Nile Virus Trends in Larimer County
Larimer County Human West Nile Virus Cases by Week of Onset, 2016-2020
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WNV –Mosquito Trapping and Testing
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WNV Program uses a 53-trap network to
determine risk
CDC designed Vector Index (VI) calculates the
abundance and infection rate, i.e., a numeric
range representing the level of risk to humans
VI of 0 indicates limited risk, 0.5 indicates a
very high likelihood of human contraction of
WNV
WNV –Adult Mosquito Applications
What is the Process when the Data shows a need to spray?
Data provided to LC Health Department by City of Fort Collins and
Colorado State University
City and County staffs work to process data
LCHDE makes a recommendation for spray to City Manager
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2021 WNV Seasonal Outlook
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UPDATE AFTER JUNE 20 RELEASE!!!
WNV Communications
WNV Season Communication to Council:
Weekly memo via packet; highlight current conditions
Anticipate elevating risk early to mid August
WNV Season Communication to Community:
Social and Traditional Media
Data posted on web
Door hangers in areas of severe amplification
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July 6, 2021
West Nile Virus –A Community Report
Tom Gonzales, Larimer County Public Health Director