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EHV in Georgia: Two Cases Confirmed in Morgan County

The Equine Disease Communication Center (EDCC) reported Jan. 24 that officials have confirmed two cases of equine herpesvirus-1 (EHV-1)—including one case of equine herpes myeloencephalopathy (EHM), the neurologic form of EHV-1—in Morgan County, Georgia.

“The Georgia Department of Agriculture’s (GDA) Animal Industry Division has confirmed two cases of EHV-1, including one EHM case, and three suspect cases at a Morgan County facility,” the EDCC said. “All equids on the farm are being monitored. None are showing clinical signs of the disease at this time.”

The GDA has placed an official quarantine on the facility, the EDCC said.

EHV 101

Herpesvirus is highly contagious among horses and can cause a variety of ailments in equids, including rhinopneumonitis (a respiratory disease usually found in young horses), abortion in broodmares, and EHM. In many horses, the first or only sign of EHV-1 infection is fever, which can go undetected.

In addition to fever, other common signs of EHV-1 infection in young horses include cough, decreased appetite, depression, and a nasal discharge. Pregnant mares typically show no signs of infection before they abort, and abortions usually occur late in gestation (around eight months), but can be earlier. Abortions can occur anywhere from two weeks to several months following infection with EHV-1.

Horses with the neurologic form usually have a fever at the onset of the disease and might show signs of a respiratory infection. A few days later, neurologic signs such as ataxia (incoordination), weakness or paralysis of the fore- and hind limbs, urine retention and dribbling, loss of tail tone, and recumbency (inability to rise) develop.

Herpesvirus is easily spread by nose-to-nose or close contact with an infectious horse; sharing contaminated equipment including bits, buckets, and towels; or clothing, hands, or equipment of people who have recently had contact with an infectious horse. Routine biosecurity measures, including hygiene and basic cleaning and disinfection practices, should be in place at all times to help present disease spread.

Current EHV-1 vaccines might reduce viral shedding but are not protective against the neurologic form of the disease. Implementing routine biosecurity practices is the best way to minimize viral spread, and the best method of disease control is disease prevention.

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