Board of Health in counties having civil service qualifications and appointment. When this Division is adopted by resolution in counties over 500,000 population where Civil Service Qualifications and appointment on all employees prevail, and where all funds expended are approved by budget of the County Board of Commissioners and so paid after approval, by the County Treasurer, the County Board of Commissioners shall constitute the Board of Health to carry out the provisions of this Division in a similar manner to other acts and duties of the County.