VSV Update 05/11/2020: Confirmed in additional counties in AZ, NM, and TX

Vesicular Stomatitis Spreads to More Counties in Arizona, New Mexico and Texas

The 2020 VSV outbreak began on April 13, 2020, when the National Veterinary Services Laboratories (NVSL) in Ames, Iowa confirmed the first VSV-positive premises in Dona Ana County, New Mexico. Arizona and Texas subsequently broke with VSV cases which were confirmed by NVSL on April 22, 2020 (Cochise County, Arizona) and April 23, 2020 (Starr County, Texas).

Since the start of the outbreak, 23 VSV-affected premises have been identified (21 confirmed positive, 2 suspect). Twenty (20) of these premises have only equine species clinically affected and 3 premises have clinically affected cattle (Starr and Zapata Counties, Texas).

Arizona has identified 5 affected premises (5 confirmed positive, 0 suspect) in 4 counties (Cochise, Gila, Pima, and Pinal Counties). New Mexico has identified 12 affected premises (10 confirmed positive, 2 suspect) in 6 counties (Bernalillo, De Baca, Dona Ana, Eddy, Grant and Sierra Counties). Texas has identified 6 affected premises (6 confirmed positive, 0 suspect) in 3 counties (El Paso, Starr, and Zapata Counties).

Please see the USDA APHIS Veterinary Services website to read the current situation report for all confirmed cases in the US.

What Colorado Veterinarians Need to Know

While there have been no cases of VSV in Colorado this year, these cases in southern states indicate that we could see cases in Colorado during the upcoming vector season.  

At this time in Colorado all suspect VSV cases in horses and livestock must be investigated by state or federal animal health officials until Colorado has an index VSV case.  

Any vesicular disease of livestock and horses is reportable to the State Veterinarian’s Office in Colorado.  Report any cases that have clinical signs suggestive of Vesicular Stomatitis Virus (VSV) immediately by calling 303-869-9130.  If it is after hours, the office voice message will indicate which staff veterinarian is on call.  

Veterinarians may also contact the state or federal field veterinarian in your area.  


Additional resources:

CDA Vesicular Stomatitis Information

USDA APHIS Veterinary Services National VSV Update