Mo. Rev. Stat. § 192.140
Whenever the department of health and senior services considers it necessary to secure the aid and services of a visiting public health nurse, or to disinfect any building, residence or room in any hotel or dormitory, or other place in such city or county infected with infectious or contagious diseases, such department shall make formal written report of such fact to the county commission or mayor of any city of the second, third, or fourth class, or both such commission and mayor, and therein recommend the course of action necessary and advisable to be taken in relation thereto to prevent the spread of such infectious or contagious diseases; and in case said report is made to the mayor of any city he shall lay the same before the city council at its next meeting, and the said city council and the said county commission at its next meeting after said report has been made as aforesaid, shall consider said report and recommendation and act upon it, and such city council and county commission shall each be authorized to employ, at a fixed monthly compensation, a public health nurse, qualified for such service by registration as such according to the laws of this state, to visit any family, home, boardinghouse, dormitory or club in which is a member or members, a person or persons afflicted with a contagious or infectious disease, and upon the consent of such person or family or parent or guardian, if a minor, to assist in nursing said person and to advise such person and the persons or members of the family, boardinghouse, dormitory or club, as to the proper methods to be pursued to prevent the spread of such infectious or contagious disease, and also to authorize some other proper person or persons to visit and disinfect any building, residence, room in any hotel or dormitory or other place therein infected with such infectious or contagious disease upon the consent of the owner thereof.
§ 192.140, RSMo