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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.



Sacramento County, CA
Outbreak Identifier: 5645
Alert ID: 3550
January 09, 2024
Confirmed Case(s) - Official Quarantine

VSV Situation Report 1/9/2024

Since the last situation report (1/3/2024), there have been 2 new VSV-affected premises (2 confirmed positive) identified in California.  All confirmed cases in the 2023-2024 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows:  

California

  • Sacramento County – 2 new confirmed positive equine premises
  • Current VSV-affected counties in California:  Sacramento County          

Since the start of the outbreak (5/17/2023), 319 VSV-affected premises have been identified (99 confirmed positive, 220 suspect) in 3 states, California, Nevada, and Texas.  Three hundred nine (309) of these premises have had only equine species clinically affected, seven (7) premises had only clinically affected cattle (Fresno County, San Diego County, and Santa Barbara County, California), two (2) premises had both equine and cattle clinically affected (Fresno County and Mariposa County, California), and one (1) premises had clinically affected rhinoceros (San Diego County, California). 

California has identified 316 affected premises (96 confirmed positive, 220 suspect) in 19 counties (Fresno, Inyo, Kings, Los Angeles, Madera, Mariposa, Merced, Orange, Placer, Riverside, Sacramento, San Bernardino, San Diego, San Joaquin, San Luis Obispo, Santa Barbara, Tulare, Tuolumne, 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).  

All VSV-affected premises were released from quarantine in Nevada on August 9, 2023, and in Texas on August 22, 2023.  Two (2) VSV-affected premises are currently under quarantine in California.

Additional information and maps of the affected area are contained in the attached situation report.  The situation report is 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: 3541, 3535, 3525, 3518, 3507, 3496, 3491, 3489, 3475, 3464, 3450, 3436, 3413, 3401, 3376, 3350, 3314, 3282, 3263, 3210, 3174, 3152, 3145, 3126, 3115, 3111, 3099, 3090, 3085, 3071, 3066, 3060