EHV-1: Additional Non-Neurologic Case Identified in Calif.

The California Department of Food and Agriculture (CDFA) has confirmed that a mare from Santa Barbara County, Calif., was positive for a non-neurologic form of equine herpesvirus-1 (EHV-1) at necropsy on April 6.

According to a CDFA statement, the 11-year-old mare became ataxic (incoordinated) and recumbent in her stall on March 30. She was placed under veterinary care, but was unresponsive to treatment, the statement said. The mare was euthanized on March 31.

The mare was shipped to the California Animal Health and Food Safety Laboratory for necropsy, the statement said. She was confirmed positive for non-neurologic EHV-1 on April 6, the statement said.

No additional information was immediately available.

Meanwhile, a mare in Los Angeles County, Calif., who tested positive for a non-neurologic strain of EHV-1 on March 30 was euthanized April 7 after developing severe laminitis.

The Los Angeles County mare was the fourth California horse confirmed positive for the non-neurologic strain stemming from the HITS Thermal Horse Show, which took place March 5-11, 2012, in Thermal, Calif. The other three horses have recovered and have been released from quarantine.

Although it's not transmissible to humans, EHV-1 is highly contagious among horses and camelids, and it is generally passed from horse to horse via aerosol transmission (when affected animals sneeze/cough) and contact with nasal secretions. The disease can cause a variety of ailments in equines, including rhinopneumonitis (a respiratory disease usually found in young horses), abortion in broodmares, and myeloencephalopathy (EHM, the neurologic form). will continue to provide updates as more information becomes available.

About the Author

Erica Larson, News Editor

Erica Larson, news editor, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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