HomeMy WebLinkAboutMemo - Mail Packet - 9/8/2020 - Memorandum From Matt Parker, Amy Resseguie, Tyler Marr Re: West Nile Virus (Wnv) Update
City Manager’s Office
PO Box 580
300 LaPorte Ave.
Fort Collins, CO 80522
970.221.6505
970.224.6107 - fax
fcgov.com
MEMORANDUM
Date: September 3, 2020
To: Mayor and City Councilmembers
From: Matt Parker, Supervisor, Natural Areas
Amy Resseguie, Sr. Specialist, Communications
Tyler Marr, Interim Director, Information & Employee Services
Through: Darin Atteberry, City Manager
Kelly DiMartino, Deputy City Manager
John Stokes, Interim Director, Community Services
Mike Calhoon, Director, Parks
Zoe Shark, Interim Director, Natural Areas
Mark Sears, Manager, Natural Areas
Re: West Nile virus (WNV) Update
Summary:
WNV activity has decreased with a continued downward trend anticipated. Trapping and testing
will conclude after one more data point on Monday, September 7 (Week 36). Overnight lows in
the low 50s and below are expected to drastically reduce mosquito breeding, bringing the
season to an end in the coming 1-2 weeks.
Current Vector Index:
Week No: 35 Vector Index
Threshold:
Previous Week
Vector Index:
Current Vector
Index:
FC – Zone NW NA 0.03 0.00
FC – Zone NE NA 0.00 0.11
FC – Zone SE NA 0.51 0.20
FC – Zone SW NA 0.11 0.07
FC – Citywide NA 0.19 0.12
Floating Zone 0.75 0.66 0.31
Current Conditions: Abundance data from the trapping system confirm a significant decrease in the
mosquito population; this is expected to continue with next week’s data. Overnight low temperatures
will continue to drive those values lower. Drastic spikes in the Vector Index value do occur – last year
the VI increased by over .6 in a single week – but typical spikes occur at the scale of 0.4 - 0.5. With the
coming low temperatures and the cessation of trapping and testing, a County recommendation to spray
is not expected.
DocuSign Envelope ID: 8525537B-46B8-48CE-9843-87C4BB01E643
Process for Spray Recommendations: If the vector index exceeds 0.75, the LCDHE typically makes a
treatment recommendation to the City; areas of concern will be identified based on data from a
minimum of five traps. Identified treatment areas may be sub-zone or may cross zone boundaries.
Outreach and Public Awareness:
Door hangers were distributed to a 5-square mile area core area of high WNV activity over the past two
weeks. Digital, print and radio advertising; street banners; bus bench ads; and social media content
have largely ended for the season. Outreach materials and messaging were shared in both English and
Spanish.
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. Please example below.
DocuSign Envelope ID: 8525537B-46B8-48CE-9843-87C4BB01E643