Where Cases Are Being Reported Now

According to updates from the Equine Disease Communication Center (EDCC) and multiple state agencies, this outbreak is now clearly multi-state:

• The index cluster has been traced back to the Waco, Texas, barrel racing and rodeo events.
• As of November 25, 2025, at least 33 confirmed EHV cases linked to the Waco event have been reported in eight states: Texas, Oklahoma, Louisiana, Colorado, New Mexico, Washington, Arizona, and South Dakota.
• Earlier updates noted confirmed neurologic EHM cases and additional EHV-1 positives in Texas, Oklahoma, Colorado, and Louisiana, with at least two horses euthanized in Texas due to severe disease

Several other states, including Missouri, North Dakota, and New Mexico, have issued alerts or confirmed individual cases connected to horses that traveled to or from these Texas and Oklahoma events, underscoring how quickly EHV follows the competition circuit.