According to United States Department of Agriculture Veterinarians
The final report from the U.S Dept. of Agriculture Animal and Plant Health Inspection Service confirmed on June 23, 2011 the EVH-1 outbreak has been contained.
According to APHIS a total of 57 horses were confirmed infected with EHV-1.
There were 28 with primary infections and 29 with secondary infections.
The outbreak originated in Ogden Utah at a National Cutting Horse competition between April 29, 2011 thru May 8, 2011. According to APHIS, more than 400 horses across 19 states were exposed to EVH-1 and 1,685 were exposed by association.
EVH-1 Update, by amy elizabeth
Resource: Bridle & Bit