Whenever the Health Officer notifies the occupant of a business building in writing that there is evidence of rat infestation of the building, such occupant shall immediately institute rat eradication measures and shall continuously maintain such measures in a satisfactory manner until the premises is declared by the Health Officer to be free of rat infestation. Unless such measures are undertaken within five days after receipt of notice it shall be construed as a violation of the provisions of this article and occupant shall be held responsible therefor. (1967 Code Sec. 16-8)