Ohio Rev. Code Ann. § 3707.11

A board of health of a city or general health district, or the authority having the duties of a board of health under section 3709.05 of the Revised Code, may only issue a quarantine or isolation order under this chapter that applies to individuals who have been medically diagnosed with the disease that is the subject of the order or individuals who have come in direct contact with someone who has been medically diagnosed with the disease that is the subject of the order.