The vesicular stomatitis virus (VSV) outbreak that began in mid-May has been expanding. As of June 30, there have been 114 VSV-affected premises identified, with 39 confirmed VS cases and 75 suspected VS cases in two states: California and Texas. Of the 114 premises, 59 have been released from quarantine and the remaining 55 are still under official quarantine.
There was only one VS-positive case in Texas. The affected horses in California reside in Los Angeles, Orange, Riverside, San Bernardino, San Diego and Ventura counties.
A timeline of the disease outbreak is below.
On May 17, the National Veterinary Services Laboratories in Ames, Iowa, confirmed one case of vesicular stomatitis virus in San Diego County, California. It was the New Jersey serotype. The affected horse was an 11-year-old Quarter Horse mare. The premises were placed under official quarantine. Three other cases of VSNJ were confirmed in San Diego County.
On May 22, 15 new premises in California were identified as VSV-affected, including two positive cases in Riverside County.
On May 26, seven new premises were identified as VSV-affected. All cases were the New Jersey virus serotype. In total, there have been 26 VSV-affected premises, with nine positives and 17 suspected cases, all in California.
On June 2, 18 additional VSV-affected premises were identified in Riverside, San Bernadino and San Diego counties.
On June 6, 18 more counties were deemed VSV-affected in Orange, Riverside, San Bernadino and San Diego counties.
On June 9, 14 more premises were deemed VSV-affected, including one in Los Angeles County.
On June 15, VSV (New Jersey serotype) was confirmed in Maverick County Texas, in a 15-year-old Quarter Horse gelding. Additionally, 18 additional premises in California were identified as VSV affected.
On June 16, again 18 new VSV-affected premises were identified in California in already-affected counties.
On June 22, eight new VSV-affected premises were identified in Ventura County, California.
On June 30, 10 new VSV-affected premises were identified in California and the Maverick County, Texas quarantine was released.
Vesicular stomatitis virus is a viral disease that can affect horses, donkeys, mules, cattle, swine and camelids in the Western hemisphere. The disease can cause blisters and ulceration of the lips, tongue, nose, ears, sheath, teats or coronary bands. The disease is transmitted by biting midges. There is no treatment and most animals recover from the disease.
Read more at the Equine Disease Communication Center.
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