It's on the ing article you linked:
Kentucky law gives county health departments the clear power to isolate infected patients who refuse to stay home. Isolation separates sick people with a communicable disease, while quarantine separates and restricts the movement of people potentially exposed.
Nelson County Judge-Executive Dean Watts said the involuntary isolation of the county resident was permitted after he declared a county emergency.
In most states, breaking a quarantine order is a misdemeanor, according to the Centers for Disease Control, although Kentucky law does not provide a penalty.