All employees of said institutions shall, before employment and at least annually thereafter, have a physical examination, including a test for tuberculosis (skin or x-ray) performed by a physician licensed to practice within a state or territory of the United States. A report of such examination, including a statement that the employee has been found free of communicable disease and specifying the tests performed and the results thereof, shall be retained in an employee file and made available for inspection by a representative of the Director.