Colorado is requiring permits for bringing horses into the state. Two of the six infected horses there have been euthanized. For the very latest, check the Colorado Department of Agriculture. Ten horses in California are currently infected. Other states with confirmed cases include Washington, Utah, Idaho, Oregon, and New Mexico. Canada now has four confirmed cases; one in Alberta and three in British Columbia.
Most veterinary professionals and state agencies are advising horse owners to limit travel, particularly to states with confirmed cases. Talk to your vet for the latest info specific to your local area; he or she will be receiving real-time updates from state agencies and authorities.
More on EHV-1
Neurologic EHV-1: The Top Five Things You Need to Know
EHV-1 -- What Do I Need to Know RIGHT NOW?
Simple Disinfection Protocol for EHV-1