The Ohio Department of Agriculture announced a revision to a ban on horses infected with a particular virus entering the state. 

Initially, horses from counties in seven states that had animals infected with Vesicular Stomatitis (VSV) would not be allowed to enter the state at all.

Now, horses from those counties will be permitted into the state as long as they have a note from a veterinarian verifying their health. 

This applies to all horses, including those intending to participate in the All American Quarter Horse Congress in Columbus.

State veterinarian, Dr. Tony Forshey, updated the requirements for entry into the state in the following way. 

"All equine entering Ohio from a state where VSV has been diagnosed within the last seven days, or a state that contains a premises quarantined for VSV, shall be accompanied by a certificate of veterinary inspection (health certificate) dated within seven days of entry, containing the following statement, 'All animals identified on the certificate of veterinary inspection have been inspected and found to be free from clinical signs of vesicular stomatitis,' " Forshey said.

Horses from premises with infected animals or that have been quarantined are still barred from entering Ohio. 

VSV is defined as a viral disease that primarily affects horses, but can also infect cattle, swine, sheep, and goats.

It causes blister-like lesions that burst and leave open wounds, and is extremely painful to animals and can result in the inability to eat and drink and even lameness.

VSV is highly contagious, being transmitted most often from biting insects.

Humans that come in contact with lesions, saliva, or nasal secretions from infected animals can also contract VSV.  In humans, the disease causes flu-like symptoms such as fever, muscle ache, headache, and nausea.

States with confirmed or suspected cases of VSV are Colorado, Nebraska, New Mexico, Texas, Utah, and Wyoming.