West Nile Virus Hits Colorado Horses

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Broomfield, Colo. - Cases of vesicular stomatitis (VSV) have been identified in the following 35 Colorado counties:  Adams, Alamosa, Arapahoe, Archuleta, Boulder, Broomfield, Chaffee, Conejos, Delta, Dolores, Douglas, Eagle, El Paso, Fremont, Garfield, Gilpin, Grand, Gunnison, Jefferson, La Plata, Larimer, Las Animas, Mesa, Mineral, Montezuma, Montrose, Morgan, Ouray, Park, Pueblo, Rio Blanco, San Miguel, Summit, Teller, and Weld. The total count of premises under quarantine for VSV by county is updated regularly on the  CDA VSV website.  
Two cows have tested positive for VSV on a small cow/calf operation in Larimer county.  These cows had recently been brought down from summer pasture at a different location in Larimer county.  
"This is the time of year when we potentially see more bovine cases, when cattle are transported down from summer pastures in the mountains," said Colorado State Veterinarian Dr. Keith Roehr. "It is important that cattle producers and veterinarians inspect cattle coming off grass for VSV lesions, particularly oral and mammary lesions, and report any suspect cases to our office."
If VSV lesions are suspected, it should be reported to the state veterinarian’s office at 303-869-9130.  All non-equine cases must be investigated by a state/federal veterinarian.  
Image result for west nile virusPhoto Credit to: westnile.ca.gov

Humans may become infected when handling affected animals, but this is a rare event.  To avoid human exposure, individuals should use personal protective measures when handling affected animals.
  • Strict fly control is an important factor to inhibit the transmission of the disease.
  • Avoid transferring feeding equipment, cleaning tools or health care equipment from other herds.
  • Colorado veterinarians and livestock owners should contact the state of destination when moving livestock interstate to ensure that all import requirements are met. Contact information for all state veterinarian offices is listed here.  
  • Colorado fairs, livestock exhibitions, and rodeos may institute new entry requirements based on the extent and severity of the current VS outbreak. Certificates of veterinary inspection (CVIs or health certificates) issued within 2-5 days prior to an event can be beneficial in reducing risks. Be sure to stay informed of any new livestock event requirements. See the Vesicular Stomatitis Guidelines for Shows and Fairs.  

Important Points for Veterinarians and Horse Owners
Any vesicular disease of livestock is reportable to the State Veterinarian’s Office in Colorado – to report call 303-869-9130. If after hours, the voice message will indicate which staff veterinarian is on call.


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