Update 4/22/2021—ThePennsylvania Department of Agriculture has released the last remaining EHM quarantine in Chester County, Pennsylvania. All the horses at the boarding stable are well and have tested negative for EHV-1 by PCR testing of nasal swabs and whole blood.
The Pennsylvania Department of Agriculture posted an Order of Special Quarantine at an equine boarding facility for show horses in Chester County, Pennsylvania, due to the detection of EHV-1 in multiple febrile horses on the premises.
Investigation is ongoing, but due to a possible connection to an equine herpesvirus meyloencephalitis (EHM, also known as neurologic equine herpesvirus) case not located at this premises, the Department has issued an official quarantine and is working with the very proactive barn management and private practitioners to monitor the health of the horses on the premises.
Clinical signs in the confirmed horses included fever. There were 23 horses exposed at that facility.
Information for this report was provided by the Equine Disease Communication Center.
![[Aggregator] Downloaded image for imported item #20006](https://s3.amazonaws.com/wp-s3-equimanagement.com/wp-content/uploads/2026/05/29132751/EDCC-Unbranded-7-scaled-1-768x512.jpeg)
![[Aggregator] Downloaded image for imported item #20008](https://s3.amazonaws.com/wp-s3-equimanagement.com/wp-content/uploads/2026/05/29132757/EDCC-Unbranded-15-scaled-1-768x511.jpeg)
![[Aggregator] Downloaded image for imported item #19998](https://s3.amazonaws.com/wp-s3-equimanagement.com/wp-content/uploads/2026/05/29122748/EDCC-Unbranded-5-scaled-1-768x512.jpeg)