Confirmed Case(s) – Official Quarantine
Comments: Since the last situation report (12/9/2025), there has been one (1) new confirmed VSVpositive equine premises identified in Arizona (Santa Cruz County). All confirmed cases in the 2025 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Since the last situation report (12/9/2025), 1 affected premises in Santa Cruz County was released from quarantine. Premises that have diagnostic laboratory confirmation of VSV are categorized as confirmed positive premises. Once a county is confirmed as VSV-positive, new equine premises presenting with clinical signs of VSV in that county are not required to be tested for confirmation of the disease, but the premises will be quarantined and classified as a presumptive positive premises. Premises may also be classified as presumptive positive if clinical animals on the premises fail to meet confirmed case definition, but there is diagnostic laboratory evidence of recent VSV infection.; Confirmed and presumptive positive premises are quarantined for at least 14 days from the onset of lesions in the last affected animal on the premises.
For more information, go to https://www.aphis.usda.gov/sites/default/files/vsv-sitrep-12-30-25.pdf
See past published Outbreak Alerts: www.coloradohorsesource.com/category/news/alerts
Updates on current disease outbreaks are listed on our EDCC website 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. All information is sourced from: http://equinediseasecc.org/alerts/outbreaks