(1)In the event of any municipal area or any part thereof being affected or threatened by an outbreak of any dangerous disease among the inhabitants thereof or of any epidemic disease among any animals therein, the Municipal Commissioner or the Executive Officer may, if he thinks that the other provisions of this Act and the provisions of any other law for the time being in force are insufficient for the purpose of preventing the outbreak of such disease, with the previous approval of the municipality, -(a)take such special measures, and(b)by notice, give such directions to be observed by the public or by any class or section of the public as he thinks necessary to prevent the outbreak of such disease:Provided that where, in the opinion of the Municipal Commissioner or the Executive Officer, immediate action is necessary, he may take such action without such approval and shall forthwith report such action to the municipality.