Seven horses reported in Colorado with West Nile virus. Several more are infected and die from Eastern equine encephalomyelitis in Texas. Another is quarantined for fear of spreading a reproductive disease in Florida.
All these instances occurred in late 2008 and 2009, and horse owners need to be even more aware of the importance of vaccinating their horses against infectious disease.
Dr. Carolynn MacAllister, Oklahoma State University Cooperative Extension veterinarian, urged owners to be aware of the disease following reports of infected horses in surrounding states.
"It takes a week to 10 days after a vaccination for a horse to develop protective antibodies," MacAllister said in an OSU news release in July 2009. "Booster shots should be administered as directed to maintain the highest level of protection."