CHESTER CO., Pa. — A horse on a private farm in Chester County that tested positive for EHV-1 died on May 17 due to other issues.

According to the Equine Disease Communications Center:

The post-mortem results indicate that the horse died of an unrelated veterinary issue, not from equine herpes myeloencephalopathy (EHM, the disease caused when EHV affects the central nervous system). There have been no other horses showing signs of EHV-1 infection and there is no “outbreak” as has been reported elsewhere.

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The affected horse had been placed in isolation at its home farm on May 15 when it began to show signs of illness, including abnormal gait and stance and a high fever. As EHV-1 was detected in the horse’s nasal swab sample, all horses at the Chester County farm were quarantined.

Based on the post-mortem findings, the low levels of EHV detected on the nasal swab sample, and the absence of EHV-related illness in any of the horses on the premises, there appears to be little risk even for the horses that were in direct contact with the horse that died. Furthermore, the two horses that had moved off the farm prior to the horse getting sick pose an even lower risk of spreading EHV-1. These two horses have returned to the home farm, also remain under close monitoring and have shown no signs of illness.

Following national guidelines, and in consultation with EHV regulatory experts, the horses on the home premises will remain under quarantine with monitoring for a minimum of 14 days from when the affected horse was isolated. No quarantined horses have shown any signs of illness as of May 23.

EHV-1 causes illness in some horses and others may carry virus without showing clinical disease. In particular, horses that are under stress may be more likely to shed the virus.  For more information about EHV-1 go to    https://aaep.org/sites/default/files/Documents/DiseaseFactsheetEHV.pdf

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