California Equine Herpesvirus Update for March 23, 2022

The California Department of Food and Agriculture (CDFA) reported a new equine herpesvirus type 1 (EHV-1) quarantine in Sonoma County.

California Department of Food and Agriculture

The California Department of Food and Agriculture (CDFA) reported a new equine herpesvirus type 1 (EHV-1) quarantine in Sonoma County. Two asymptomatic horses from the index premiss in Orange County moved to home premises in Tehama County and were confirmed positive for EHV-1 on March 22. The Riverside County quarantine was released.

NEW: EHV-1 Quarantine in Sonoma County

March 23, 2022: A 14-year-old Quarter Horse mare in Sonoma County displaying neurological signs was confirmed positive for equine herpesvirus myeloencephalopathy (EHM) secondary to equine herpesvirus type 1 infection (EHV-1 neuropathogenic strain) on March 22. The horse has been isolated at her home premises since March 15, and she was quarantined along with three additional equids on the property on March 23. There is no known epidemiological link to any other current EHM incidents. CDFA was on site at the premises to conduct a site assessment and assist in implementing enhanced biosecurity measures, including twice daily temperature monitoring. CDFA will continue to closely monitor the situation.

Third EHV-1 Quarantine in Orange County

March 23, 2022: Two asymptomatic horses from the index premises in Orange County that was permitted movement to their private home premises in Tehama County were confirmed positive for EHV-1 on March 22. The horses, and their exposed cohort of three other horses that were also permitted movement from the Orange county premises, have been isolated and are under quarantine on the premises since they arrived.

Released: EHV-1 Quarantine in Riverside County

March 23, 2022: There were no additional cases to report. As there were no additional cases for 14 days on the event premises, the quarantine was released.

Second EHV-1 Quarantine in Orange County

March 23, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.

EHV-1 Quarantine in Orange County

March 23, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.

EHV-1 Quarantine in Santa Clara County

March 23, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.

Second EHV-1 Quarantine in San Mateo County

March 23, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.

EHV-1 Quarantine in San Mateo County

March 23, 2022: No additional cases have been confirmed. CDFA continues to monitor the situation.

You can also follow reports on the Equine Disease Communication Center.

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