(COLORADO) — The Colorado Department of Agriculture Animal Health Division confirmed that cases of equine West Nile Virus have been detected in Colorado.
So far, four cases of WNV have been confirmed in horses. The first case was detected in Pueblo County, an unvaccinated 18-month-old Quarter Horse filly was euthanized on July 15 after presenting with ataxia (lack of muscle coordination and control), anorexia, changes in mental functions, recumbency, and cranial nerve deficits. According to the Colorado Horse Council, treatment on the horse was initiated but was unsuccessful.
Since mid-July, three more cases have been confirmed; with two in Larimer County and one in Weld County. The Horse Council said there are two cases pending results.
WNV is a viral disease that cycles between wild birds and mosquitoes and can sometimes affect other species like people and horses (as dead-end hosts).
This year alone, the Colorado Department of Public Health and Environment (CDPHE) has reported 41 human cases, including 14 hospitalizations, 19 with neurological symptoms, and two human deaths.
Equine West Nile Virus can be characterized by ataxia, weakness or paralysis of one or more limbs, convulsions or circling and teeth grinding.
Horse owners can vaccinate their horses against the virus. According to the Horse Council, vaccinations have been proven to be safe and effective in preventing the virus. Horses will need the two-shot vaccination series within a three to four-week period, then an annual booster.
In addition to vaccination, horse owners should also reduce the mosquito populations and their possible breeding areas. Recommendations include removing stagnant water, using mosquito repellent, and keeping animals inside during bugs’ feeding time, typically in the early morning and evening.
Cases of acute equine neurologic disease must be reported to the State Veterinarian’s Office unless the cause is known toxicity or trauma. To report, call (303) 869-9130.
