West Nile Virus Moves Westward (continued) -- Page 3
West Nile Virus
Workshop to be Presented at 2002 Western States Horse Summit
Rita Schlim, coordinator for
the Western States
Horse Summit, recently announced, "We're organizing a West Nile Virus (WNV)
Workshop for the 2002 Western States Horse Summit, to include leading veterinarians and
health officials addressing the concerns of horse owners regarding the WNV.
"The Summit is directed at the twelve western states
because there's a pressing concern for horse owners, veterinarians, officials and the
public to learn more about the West Nile virus as it moves into our states. We'll be able
to present the latest facts and figures on where the virus has spread, plus we want to
educate the horse industry on any WNV preventative vaccines and care to given if a horse
does come down with the disease.
"We're also asking a
representative from Forth Dodge, which received its conditional approval last year, to
attend this workshop."
Having been expanded to a two-day
agenda, the dates for the 2002 Western States Horse Summit will be May 29-30, followed by
the Western States Horse Expo May
31 - June 2. The location will again be the Cal-Expo Fairgrounds, in the same building as
the 2001 Summit. Cal-Expo is located
just off the Interstate 50 (exit at the Exposition Boulevard ramp) in Sacramento, CA.
Registration packets, additional
agenda items and Summit information can be obtained by contacting: WSHS Coordinator Rita
Schlim by phone at 510-657-5827 or via email at email@example.com
Guidelines for Phased Response to West Nile Virus Surveillance Data
||Probability of human outbreak
Recommended response (Local and regional characteristics may alter the risk level at which
specific actions must be taken)
Off-season; adult vectors
inactive; climate unsuitable.
|Develop WNV response plan. Secure
surveillance and control resources necessary to enable emergency response. Initiate
community outreach and public education programs.
|Spring, summer, or fall; areas unlikely
to WNV epizootic in 2002 based on lack of previous or current WNV activity in the region.
||Responses as in category 0, plus: Conduct
entomologic survey (inventory and map mosquito populations; see AM CA and other manuals
for guidance); community outreach and public education; avian mortality, human
encephalitis/meningitis and equine surveillance.
|Spring, summer, or fall; areas
anticipating WNV epizootic in 2002 based on previous or current WNV activity in the
region; no current surveillance findings indicating WNV.
||Response as in category 1a, plus: Source
reduction; use larvicides at specific sources identified by entomologic survey and
targeted at likely amplifying and bridge vector species; maintain avian mortality vector
and virus surveillance; public education emphasizing source reduction.
|Spring, summer, or fall; areas with
initial, sporadic or limited WNV epizootic activity in birds and/or mosquitoes.
||Response as in category 1b, plus:
Increase larval control and source reduction and public education emphasizing personal
protection measures, particularly among the elderly. Enhance human surveillance and
activities to further quantify epizootic activity (e.g., mosquito trapping and testing).
Consider focal or targeted adult mosquito control if surveillance indicates likely
potential for human risk to increase.
|Spring, summer or fall; areas with
initial confirmation of WNV in a horse and/or a human, or moderate WNV activity in birds
||Response as in category 2, plus: Strongly
consider adult mosquito control of surveillance indicates likely potential for human risk
to persist or increase.
|Spring, summer, or fall: quantitative
measures indicating WNV epizootic activity as a level suggesting high risk of human
infection (for example, high dead bird densities, high mosquito infection rates, multiple
positive mosquito species, horse or mammal cases indicating escalating epizootic
transmission, or a human case and high levels of epizootic activity) and abundant adult
||Response as in category 3, plus: Expand
public information program to include TV, radio, and newspapers (use of repellents,
personal protection, continued source reduction, risk communication about adult mosquito
control); initiate or continue active surveillance for human cases; implement adult
mosquito control program targeted at areas of potential human risk.
Outbreak in progress
|Multiple confirmed cases in humans;
conditions favoring continued transmission to humans (see level 3)
||Responses as in category 4, plus:
Implement or intensify emergency adult mosquito control program, enhanced risk
communication about adult mosquito control, monitor efficacy of spraying on target
mosquito populations. If outbreak is widespread and covers multiple jurisdictions,
consider wide-spread aerial spraying as per the WNV Emergency Plan.
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Bonnie Davis is a Bay Area resident, free lance
writer and horsecamping/trail riding advocate with over 30 years experience. Her
stories, articles, and columns have been published in national and international
publications such as Western Horseman, Paint Horse Journal, Horse &
Horseman, Quarter Horse Journal, Western Side (Italy), Cascade Horseman, California Horse
Review, Performance Horse Review, and San Jose Mercury News. Bonnie
was a featured speaker at Horsexpo in
Sacramento in '99, '00 and '01.
© 2002 Bonnie Davis and The Bay Area Equestrian Network.