Section 7. No proprietor shall have or keep in his employ any employe who is a typhoid fever carrier, or a carrier of other intestinal infections, or of diphtheria, or who is suffering from active tuberculosis, or syphilis in its transmissible stage, or who, has any infectious disease or open external lesion, nor shall the proprietor himself or any member of his family under the same conditions have anything to do with the handling, preparation, serving or providing of food or drink to the public.