Update; From the Oregon State Veterinarian; May 19,2011

 We now have two confirmed cases of EHM in Oregon. The second case
 occurred in a horse from Umatilla County that was not at the show in
 Ogden but travelled some hours in the same trailer with two horses
 that were returning from the show. As of latest report, the EHM
 positive horse only exhibited a high temperature and not any
 neurological signs.