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Disease Alerts

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.

Ventura County, Riverside County, San Bernardino County, San Diego County, Los Angeles County, Orange County, CA
Outbreak Identifier: 5645
Alert ID: 3071
June 22, 2023
Confirmed Case(s) - Official Quarantine


VSV Situation Report 6/22/2023

Since the last situation report (6/15/2023), there have been 8 new VSV-affected equine premises identified (3 confirmed positive, 5 suspect) in California including a new infected county, Ventura County.  There are six counties currently affected in California (Los Angeles, Orange, Riverside, San Bernardino, San Diego, and Ventura Counties) and one county currently affected in Texas (Maverick County).  All confirmed cases have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows:  


  • Riverside County – 1 new confirmed positive and 3 new suspect equine premises
  • San Diego County – 1 new confirmed positive premises and 2 new suspect equine premises
  • Ventura County (New Infected County) – 1 confirmed positive equine premises
  • Since the last situation report (6/15/2023), the following previously confirmed positive or suspect premises have been released from quarantine: 4 equine premises in Riverside County, 2 equine premises in San Bernardino County, and 1 equine premises in San Diego County.


  • No new confirmed positive or suspect premises have been identified. 

Since the start of the outbreak, 104 VSV-affected premises have been identified (36 confirmed positive, 68 suspect) in 2 states, California and Texas.  One hundred one (101) of these premises have had only equine species clinically affected, two (2) premises have had clinically affected cattle (San Diego County, California), and one (1) premises has had clinically affected rhinoceros (San Diego County, California). 

California has identified 103 affected premises (35 confirmed positive, 68 suspect) in 6 counties (Los Angeles, Orange, Riverside, San Bernardino, San Diego, and Ventura Counties).  Texas has identified 1 affected premises (1 confirmed positive) in 1 county (Maverick County, Texas).  

Of the 104 total VSV-affected premises, 35 premises have completed the quarantine period with no new clinical cases and have been released from quarantine.  Sixty-nine (69) premises remain quarantined.  

Additional information and maps of the affected area are contained in the situation report which is posted publicly on the APHIS website and accessible at the following link:

Previous Alerts: 3066, 3060