California Quarantine for Neurologic EHV Lifted

Officials release the Shasta County premises after more than two weeks of monitoring for equine herpesvirus myeloencephalopathy.

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On Nov. 1, California Department of Food and Agriculture (CDFA) officials released the quarantine on a Shasta County premises where two horses had been confirmed positive for the neurologic form of equine herpesvirus-1 (EHV-1) in early October.

Two additional horses tested positive for the virus:

  1. Case No. 3 from a different Shasta County premises that traveled in the same trailer as case No. 1 to an event at the Rolling Hills Equestrian Center, in Corning, California, on Sept. 27-29; and
  2. Case No. 4, from Sonoma County, who also participated in the event at Rolling Hills Equestrian Center.

The CDFA monitored all four horses, and on Oct. 24 the index horse on the quarantined Shasta County premises, a 20-year-old Quarter Horse gelding, had his second negative test at seven-day intervals. On Nov. 1, case No. 2 also had its second negative test at seven-day intervals.

No EHV quarantines now exist in Shasta County

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