Climate and movement are quietly changing the rules.
Veterinarians are increasingly uneasy because a virus once considered geographically predictable is no longer behaving that way. Changes in temperature, rainfall, and animal movement have created conditions that favor faster spread, longer transmission seasons, and outbreaks in places with no prior exposure. Horses in these regions lack immunity, surveillance systems are uneven, and early symptoms are easy to miss. What alarms experts most is not a single outbreak, but the pattern forming beneath it. The systems that once contained equine disease are being stretched, and veterinarians know how quickly that can turn deadly.
