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Volume 7, Number 4—August 2001
THEME ISSUE
West Nile Virus
West Nile Virus

West Nile Virus Outbreak Among Horses in New York State, 1999 and 2000

Susan C. Trock*Comments to Author , Barry J. Meade†, Amy L. Glaser*, Eileen N. Ostlund‡, Robert S. Lanciotti§, Bruce C. Cropp§, Varuni Kulasekera¶, Laura D. Kramer**, and Nicholas Komar§
Author affiliations: *Cornell University, Veterinary Diagnostic Laboratory, Ithaca, New York, USA; †U.S. Department of Agriculture (USDA), Veterinary Services, Frankfort, Kentucky, USA; ‡USDA, National Veterinary Services Laboratories, Ames, Iowa, USA; §Centers for Disease Control and Prevention, Fort Collins, Colorado, USA; ¶New York City Department of Health, New York City, New York, USA; **Arbovirus Research Laboratory, Wadsworth Center, Albany, New York, USA

Main Article

Table

Horses with neurologic illness New York, 2000

Sign No. (%) of case-horsesa No. (%) of non-case horsesb
Ataxia 22/23 (95.7) 16/19 (84.2)
Rear 19/21 (90.5) 15/19 (78.9)
All four limbs 15/20 (75) 9/19 (47.4)
Acute onset 19/21 (90.5) 12/18 (66.7)
Fever (>101°F) 7/22 (31.8) 8/15 (60)
Mean 102.4°F 104°F
Range 101.4 - 103 102-106
Muscle fasciculation 11/20 (55) 5/19 (26.3)
Almost fallc 8/17 (47.1) 6/18 (33.3)
Down 9/22 (40.9) 4/17 (23.5)
Rise with assist 6/21 (28.6) 5/18 (27.8)
Died 8/23 (34.8) 8/19 (42.1)
Dull, lethargic 5/19 (26.3) 10/19 (52.6)
Hypermetric 4/16 (25) 4/19 (21.1)
Agitated 3/19 (15.8) 2/18 (11.1)

aWest Nile (WN) virus confirmed by laboratory testing. Denominator varies depending upon completeness of information provided during interview.
bWN virus negative by laboratory testing. Denominator varies depending upon completeness of information provided during interview.
cPrivate practitioners reporting that circling the horse would cause it to fall.

Main Article

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Page updated: April 27, 2012
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The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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