ADVERTISEMENT The death toll has risen to 12 in the equine herpesvirus-1 (EHV-1) outbreak that began at an international jumping competition in Spain in February. Competition organizers and scientists are scrambling to understand the details leading up to the crisis. The outbreak includes neurologic cases and is “very, very aggressive,” said Göran Akerström, DVM, veterinary director of the Fédération Equestre Internationale (FEI). Since The Horse’s previous report on March 4 of six horse deaths, two more at the Valencia hospital have occurred, as well as one in Barcelona and one in Germany, the FEI reported. Nearly 200 horses remain quarantined at the competition venue in Valencia by government officials in Spain, where EHV-1 is a reportable disease, said Anne Couroucé, DVM, PhD, Dipl. ECIEM, of the International Horse Health Center (CISCO), in Nantes (Oniris), France. The French Equestrian Federation (FFE) commissioned Couroucé to provide support on-site in Valencia.