Knox County Humane Society officials said that they believed an airborne virus that killed two dozen cats started with the facility furnace.
According to Carol Jarvis, the chairman of the board for the Knox County Humane Society, two dozen cats were euthanized after contracting an airborne illness.
The effects of the illness first appeared in the kittens at the facility. Officials cleaned the kitten room, but a second batch of kittens contracted the illness.
Larger cats then began to exhibit signs of sickness.
The cats were treated with three different types of antibiotics, but nothing helped and the cats had to be euthanized, Jarvis said.
An air duct company and furnace company came out and cleaned all the air filters and ducts.
Humane Society officials said that they have scrubbed every surface of the facility and opened the windows.
Currently, the facility has fewer than 12 cats, but all are healthy and adoptable.
Watch 10TV News and refresh 10TV.com for more information.