Mo. Rev. Stat. § 192.310

Nothing in sections 192.260 to 192.320 shall apply to any home rule city with more than sixty-four thousand but fewer than seventy-one thousand inhabitants, or cities which now have, or may hereafter have, a population of seventy-five thousand or over which are maintaining organized health departments; provided, that such cities shall furnish the department of health and senior services reports of contagious, infectious, communicable or dangerous diseases, which have been designated by them as such and such other statistical information as the board may require.