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.

San Luis Obispo, Santa Barbara, Ventura Counties, CA
Outbreak Identifier: 5645
Alert ID: 3115
July 25, 2023
Confirmed Case(s) - Official Quarantine


VSV Situation Report 7/25/2023

Since the last situation report (7/21/2023), there have been 5 new VSV-affected equine premises identified (3 confirmed positive, 2 suspect) in California, including cases in two new infected counties, San Luis Obispo County and Santa Barbara County. All confirmed cases have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows: 


San Luis Obispo County (New Infected County) – 1 confirmed positive equine premises 

Santa Barbara County (New Infected County) – 1 confirmed positive equine premises 

Ventura County – 1 new confirmed positive and 2 new suspect equine premises

Since the last situation report (7/21/2023), the following previously confirmed positive or suspect premises have been released from quarantine: 1 premises in Los Angeles County, 1 premises in Orange County, 2 premises in San Bernardino County, 1 premises in San Diego County, and 1 premises in Ventura County. 

Texas: No new confirmed positive premises have been identified. 

Since the start of the outbreak (5/17/2023), 136 VSV-affected premises have been identified (48 confirmed positive, 88 suspect) in 2 states, California and Texas. One hundred thirty-three (133) 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 135 affected premises (47 confirmed positive, 88 suspect) in 8 counties (Los Angeles, Orange, Riverside, San Bernardino, San Diego, San Luis Obispo, Santa Barbara, and Ventura Counties). Texas identified 1 affected premises (1 confirmed positive) in 1 county (Maverick County, Texas). Of the 136 total VSV-affected premises, 82 premises have completed the quarantine period with no new clinical cases and have been released from quarantine. Fifty-four (54) premises remain quarantined. Additional information and maps of the affected area are contained in the situation report. The situation report is posted publicly on the APHIS website and accessible at the following link: https://www.aphis.usda.gov/aphis/ourfocus/animalhealth/animal-disease-information/equine/vsv/vesicular-stomatitis

Previous Alerts: 3111, 3099, 3090, 3085, 3071, 3066, 3060