No employer shall knowingly permit to work in his or her bakery, food warehouse or food manufacturing establishment any person who is affected with any pathogen that is contained in the Centers for Disease Control and Prevention’s “List of Infectious and Communicable Diseases which are Transmitted Through the Food Supply”, as amended from time to time, except in those cases in which the director of health has given written authorization stating that the public health is not endangered, and each employer shall maintain himself or herself and his or her employees in a clean and sanitary condition, with clean, washable outer clothing, while engaged in the manufacture, handling or sale of food products. The commissioner or his or her authorized agents may order any person employed in a bakery, food warehouse or food manufacturing establishment to be examined by a licensed physician if he or she has reason to believe that such employee has a condition that may transmit a food-borne illness. No person shall be allowed to smoke in a bakery, food warehouse or food manufacturing establishment while in the performance of his or her duty.