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Four more EHV-1 cases on California property

January 26, 2012

» Update: Latest case takes tally to 16

Four more horses have tested positive for the neurological form of equine herpesvirus-1 at a major equestrian facility in Orange County, California, bringing the number of cases on the premises to 15.

The Rancho Sierra Vista Equestrian Center, home to about 367 horses, is under a state-ordered quarantine.

The California Department of Food and Agriculture confirmed the four additional cases on Tuesday.

On the same day, it reported a case in Riverside County.

"At this time we are not aware of any links to the Orange County incident," a spokesman said.

The Riverside County gelding in question was tested after displaying poor hind limb co-ordination and urine dribbling.

He lay down and had to be euthanized.

The first case in Orange County was confirmed by the department on January 11, also in a gelding.

The multi-discipline facility in San Juan Capistrano has been under quarantine since, with no horse movements allowed on or off the property.

The department said only the initial confirmed positive horse has displayed neurologic signs and he is currently recovering.

All other confirmed positive horses displayed respiratory symptoms, limb swelling and/or fever.

A confirmed positive horse became recumbent and was euthanized on January 18, 2012. However, the department said the necropsy results indicated it was highly unlikely that the recumbency was due to the infection.

Signs of the disease include nasal discharge, poor co-ordination, hindquarter weakness, recumbency, lethargy, urine dribbling and diminished tail tone.

In May last year, 10 western states were hit by a major outbreak linked to the National Cutting Horse Association Western National Championship, in Ogden, Utah.



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