The current outbreak of the sometimes fatal neurologic disease caused by equine herpesvirus-1 (EHV-1) in several Western states and Canada has generated widespread concern throughout the horse industry. How many horses are really affected in this outbreak? Is this a new, mutated form of the virus? What are the signs that tell you a horse has EHV-1? Will affected horses recover? How can horse owners and veterinarians work together to prevent the disease from spreading?