The boards of health shall have the following powers:
     First–To do all acts, make all regulations which may be necessary or expedient for the promotion of health or the suppression of disease.
     Second–To appoint physicians as health officers and prescribe their duties.
     Third–To incur the expenses necessary for the performance of the duties and powers enjoined upon the board.
     Fourth–To provide gratuitous vaccination and disinfection.
     Fifth–To require reports of dangerously communicable diseases.
     No board of health constituted under this Division shall function in any county during the period that Division 5-25 is in force in that county.