The Director may, upon the application of the person in charge of any state correctional facility who has been requested in writing so to do by the physician at such facility, have removed from such facility any prisoner therein who has contracted any contagious or infectious disease dangerous to the public health to some place to be designated by the Director. When any prisoner is so removed, he shall be safely kept and treated for such disease and, as soon as he recovers his health, be returned to such facility unless the term of his imprisonment has expired, in which event he shall be discharged, but not until all danger of his spreading contagion has passed. Expenses incurred by reason of this section shall be borne by the Commonwealth.