Four More San Mateo County Horses Confirmed With EHV-1

Cases now total 23, including two with EHM.
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San Mateo County, CA
Officials confirmed four more horses with equine herpesvirus-1 (EHV-1) at the San Mateo County index premises where an outbreak began in late January. | Wikimedia Commons
On Feb. 22, California Department of Food and Agriculture (CDFA) officials confirmed four more horses with equine herpesvirus-1 (EHV-1) at the San Mateo County index premises where an outbreak began in late January.

The newly affected horses include two mares of undisclosed breeds, a 22-year-old Quarter horse gelding, and a 27-year-old Quarter Horse gelding. All four displayed fevers that began between Feb. 15 and Feb. 17, but no neurologic signs. All are recovering and isolated at the index premises.

Since the outbreak began, two horses have been confirmed with neurologic EHV-1 (equine herpesvirus myeloencephalopathy, or EHM) and 21 cases have involved fever only (EHV-1).

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.

equine herpesvirus
VIDEO | Health Alert: Equine Herpesvirus

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 EHM 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 prevent 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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