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ALTOONA, Iowa — A second horse is showing signs that it may have contracted the equine herpesvirus — a highly contagious condition, the Iowa Department of Agriculture confirmed.

One horse already tested positive for EHV. Owners say he went from healthy to near death in hours. The horse needed to be euthanized. The confirmed case was found at the Pine Hollow Stables in Altoona, where now a second horse started showing signs of EHV.

The animal is now in quarantine and being evaluated.