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Major EHV-1 update: 75 horses confirmed positive, 11 dead

May 27, 2011

» Latest state-by-state wrap

Eleven horses are dead and 75 have been confirmed as positive for Equine Herpesvirus-1 in the current outbreak in the western states of the US.

Death toll

As at 25.6.2011

New Mexico
About EHV

The latest update from the Animal and Plant Health Inspection Service (APHIS) of the US Department of Agriculture - the first in a week - said the 75 cases were confirmed across nine states.

They are Arizona, California, Colorado, Idaho, New Mexico, Nevada, Oregon, Utah and Washington.

Suspected and confirmed cases involving the potentially deadly virus are reported to be under voluntary or state quarantine, APHIS said.

Of the 75 confirmed cases, 58 are in horses that were at the Ogden, Utah event.

Eleven horses associated with the outbreak are dead or have been euthanized, APHIS said.

There are 15 newly identified premises with suspect or confirmed cases identified in the latest report.

"APHIS will continue to monitor the situation and work with the States to make decisions as needed to control the spread of the virus."

Of the 75 infected horses, 28 suffered from EHM (Equine Herpes Virus Myeloencephalopathy) - the neurological form of the disease.

Of the 11 deaths, nine were in horses exposed at the Ogden, Utah, cutting event, that appears to be at the centre of the outbreak. Two of the fatalities were in horses exposed secondarily.

EHV-1 stats - horses and premises - graphics



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