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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.

Tulare County, CA
Outbreak Identifier: 5645
Alert ID: 3401
October 07, 2023
Confirmed Case(s) - Official Quarantine


VSV Situation Report 10/6/2023 

Since the last situation report (9/29/2023), there have been 4 new VSV-affected premises (1 confirmed positive, 3 suspect) identified in California. All confirmed cases to date have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows: 


 • Tulare County – 1 new confirmed positive and 3 new suspect equine premises

 • Counties with current VSV quarantines: Fresno and Tulare Counties 

Nevada and Texas

 • No new confirmed positive premises have been identified. 

Since the start of the outbreak, 207 VSV-affected premises have been identified (71 confirmed positive, 136 suspect) in 3 states, California, Nevada, and Texas. Two hundred three (203) of these premises have had only equine species clinically affected, three (3) premises have had clinically affected cattle (San Diego County and Santa Barbara County, California), and one (1) premises has had clinically affected rhinoceros (San Diego County, California). California has identified 204 affected premises (68 confirmed positive, 136 suspect) in 10 counties (Fresno, Los Angeles, Orange, Riverside, San Bernardino, San Diego, San Luis Obispo, Santa Barbara, Tulare, and Ventura Counties). Texas identified 2 affected premises (2 confirmed positive) in 2 counties (Maverick and Shackelford Counties). Nevada identified 1 affected premises (1 confirmed positive) in 1 county (White Pine County, Nevada). Of the 207 total VSV-affected premises, 201 premises have completed the quarantine period with no new clinical cases and have been released from quarantine. Six (6) premises remain quarantined in California. Additional information and maps of the affected area are contained in the attached situation report. The situation report was posted publicly on the APHIS website on 10/6/2023 and is accessible at the following link:

Previous Alerts: 3376, 3350, 3314, 3282, 3263, 3210, 3174, 3152, 3145, 3126, 3115, 3111, 3099, 3090, 3085, 3071, 3066, 3060