Two additional Cache County, Utah, horses have tested positive for equine herpesvirus-1 (EHV-1), bringing the total number of confirmed cases in that state to four, according to a Feb. 27 update from the Utah state veterinarian’s office.

"Tests on two of three horses that were under observation returned positive results on Wednesday at 11:00 a.m ," the statement read. "One other horse remains under observation. It will be retested in the coming days. The number of confirmed or suspect cases remains at five."

Two of the five horses have been humanely euthanized because of their condition. The office confirmed the first two confirmed cases on Feb. 26.

On Feb. 27 Utah State Veterinarian Bruce King, DVM, told The Horse that all the horses involved in the current outbreak have exhibited neurologic signs and fevers

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