EHV-1 Update

SACRAMENTO, Calif. (Jan. 27, 2012) – Here is the EHV-1 update as provided by the California Department of Agriculture:

RIVERSIDE COUNTY INCIDENT

  • January 26, 2012: No new cases. CDFA will continue to monitor the situation.
  • January 25, 2012:  There are no new EHV-1 cases on the Riverside County quarantined large multi-discipline equine premises. The one confirmed positive horse for Equine Herpes Myeloencephalopathy (EHM) was euthanized and necropsy results indicate histologic lesions compatible with EHV-1.  All horses on the premises are being monitored. Based on the initial investigation, there is no evidence to link this case to the Orange County premises. CDFA will continue to monitor the situation.
  • January 24, 2012: A gelding displaying hind limb incoordination and urine dribbling from a Riverside County premises was confirmed positive for the neuropathogenic strain of Equine Herpes Virus-1 (NEHV-1). The gelding became recumbent and was euthanized. The premises is under quarantine and CDFA has initiated an epidemiologic investigation. At this time we are not aware of any links to the Orange County incident. Additional information will be posted as it becomes available.

ORANGE COUNTY INCIDENT:

  • January 26, 2012: No new cases. CDFA will continue to monitor the situaiton.
  • January 25, 2012:  There is one new confirmed case of neuropathogenic EHV-1 on the affected premises.  A total of 16 horses on the property have tested positive and only one of the confirmed cases has displayed neurologic signs.
  • January 24, 2012: Four new cases of neuropathogenic Equine Herpes Virus-1 (NEHV-1) have been confirmed on the Orange County quarantined premises. A total of 15 horses have been positive on the Orange County premises. Only one of the 15 horses has shown neurologic signs.
  • January 23, 2012: There are no new cases.     A total of 11 Neuropathogenic Equine Herpes Virus -1 (NEHV-1) positive cases have been confirmed at the quarantined Orange County premises.  Only the initial confirmed positive horse displayed neurologic signs and he is currently recovering. All other confirmed NEHV-1 positive horses displayed respiratory symptoms, limb edema and/ or fever.   A confirmed positive horse became recumbent and was euthanized on January 18, 2012; the necropsy results indicate that it is highly unlikely that the recumbency was due to the NEHV-1 infection.  The single premises remains under quarantine and CDFA continues to monitor the situation.
  • January 20, 2012: Two additional horses displaying a fever have been confirmed for the neuropathogenic strain of Equine Herpes Virus-1. There are a total of 11 confirmed positive cases on the Orange County premises. The necropsy results from the positive horse euthanized on January 18, 2012 are pending. Horses on the property continue to be monitored.
  • January 19, 2012: One new confirmed case of the neuropathogenic strain of Equine Herpes Virus-1 has been confirmed on the Orange County affected premises.  A total of 9 cases have been confirmed on this premises. On January 18, 2012, one of the positive horses which initially displayed a fever and limb edema became recumbent and the decision was made to euthanize this horse. Necropsy results as to the cause of the recumbency are pending.  The facility remains under quarantine  and  all exposed horses are being monitored.
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