The Horse

OCT 2018

The Horse:Your Guide To Equine Health Care provides monthly equine health care information to horse owners, breeders, veterinarians, barn/farm managers, trainer/riding instructors, and others involved in the hands-on care of the horse.

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Page 23 of 51

EXPOSED 24 October 2018 The Horse | On April 13 they confirmed a diagnosis of equine herpesvirus myeloencephalopathy (EHM), the neurologic manifestation of EHV-1. After an exhaustive retracing of the infected horse's steps since his arrival on the grounds, Flynn and her team deter- mined that only one barn of 56 horses had been exposed to him. They placed that barn's inhabitants under immediate strict quarantine. "This means that ... the owners, train- ers, grooms, and veterinarians were instructed to use appropriate infection control strategies, including foot baths (upon entering and exiting the barn), twice-daily temperature monitoring (of the horses), strict movement controls within the quarantined area, which included a quarantined arena to exercise," says Flynn. "Access to the quarantined area was restricted to personnel associat- ed with the exposed horses, and those per- sonnel were not permitted in other parts of the premises. ... Access to quarantined positive horses required use of disposable coveralls, gloves, and boot covers." In addition, CDFA staff members were on site daily to ensure caretakers fol- lowed biosecurity protocols and that any exposed horses displaying clinical signs would be promptly identified, samples collected and tested, and suspect cases isolated immediately until test results confirmed health status, she says. Flynn and her team recommended that caretakers of the hundreds of other horses on the property use enhanced bi- osecurity measures, including twice-daily temperature-monitoring. "Any horses in any barn on the prop- erty with fevers were sampled to ensure the disease had not spread to those other barns," says Flynn. "At the point of quar- antine issuance, there was no evidence of disease spread, and only one case—the index case—confirmed." All was quiet until five days later, April 18, when veterinarians confirmed two new EHV-1 cases in the quarantined barn. They relocated those horses to a separate isolation area on the prop- erty. All horses in the quarantined barn remained there, and the veterinarians continued monitoring all other horses on the property closely. Again, and just as everyone was begin- ning to regain hope for a swift end to this viral scourge, vets confirmed two new cases of EHV-1 on April 23. Those horses originated from the same barn as the preceding three cases. Veterinarians confirmed three addition- al cases of EHV-1 over the next two days, all from that barn, and viral transmission Dr. Katie Flynn and her team placed the barn that had been exposed to the index case and its inhabitants under immediate quarantine. COURTESY DR. KATIE FLYNN COURTESY KATIE HATCH Access to the quarantined barn was restricted to people caring for the exposed horses, who were required to use protective clothing and disinfectant foot baths.

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