When there is a case of diphtheria, acute poliomyelitis, scarlet fever or smallpox, the director of public health, or his duly authorized representative, shall post a suitable placard or placards in a conspicuous place or places on the premises, apartment or room where the disease exists; provided, that if the case is under satisfactory hospital care, the placard may be omitted, except in cases where the placard is needed for control of contacts. The director of public health shall placard any premises wherein there is any person having a communicable disease, if that person does not isolate himself in a manner that will assure the prevention or spread of disease from himself to others. No person shall remove such placard except the director of public health or his authorized representative. (Ord. Nos. 4404; 5869)