Oklahoma Tallies New VSV Cases
In its Situation Report of Aug. 13, the USDA’s Animal and Plant Health Inspection Service (APHIS) added one new confirmed positive and two new suspect premises to its list of quarantined premises. Cherokee County was confirmed with one new positive equine premises, and Craig and Rogers counties with one new suspect equine premises each.

Since its last Situation Report on Aug. 6, three previously VSV-infected or suspect premises have been released from quarantine in Adair and Rogers counties.

Since the Oklahoma outbreak began on July 7, nine counties have been affected, with 18 confirmed positive and four suspect premises. Fifteen premises have been released from quarantine, and seven premises remain quarantined in the following counties:

  • Cherokee (3)
  • Craig (1)
  • Osage (1)
  • Ottawa (1)
  • Rogers (1)

Premises with confirmed positive and suspect cases are quarantined and monitored by veterinarians for at least 14 days from the onset of lesions in the last animal affected on the premises.

VS 101

Vesicular stomatitis virus can cause blisters and sores in the mouth and on the tongue, muzzle, teats, or hooves of horses, cattle, swine, sheep, goats, llamas, and a number of other animals. Lesions usually heal in two or three weeks.

Because of the virus’ contagious nature and its resemblance to other diseases such as foot-and-mouth disease, animal health officials urge livestock owners and caretakers to report these symptoms to their veterinarian immediately. Most animals recover with supportive care by a veterinarian.

“Vesicular stomatitis has been confirmed only in the Western Hemisphere,” APHIS said on its website. “It is known to be an endemic disease in the warmer regions of North, Central, and South America, and outbreaks of the disease in other temperate geographic parts of the hemisphere occur sporadically. The Southwestern and Western United States have experienced a number of vesicular stomatitis outbreaks … Outbreaks usually occur during the warmer months, often along waterways.” According to Angela Pelzel McCluskey, DVM, APHIS’ equine epidemiologist, the largest VS outbreak in more than 40 years of recorded history occurred in 2019.

Some states and other countries might restrict movement of, or impose additional requirements for, susceptible animals from states having known VS cases. Before moving livestock, contact the state of destination for its requirements.