65 ILCS 5/11-17-3
When it has been decided to establish and maintain a public health board under this Division 17, the mayor or president, with the approval of the corporate authorities, shall appoint a board of 5 directors, 2 of whom are duly licensed to practice medicine and surgery in the State of Illinois and have been in the actual practice of their profession, and the other 3 of whom are citizens of the municipality. The directors shall be chosen with reference to their special fitness for that office.
One of the directors shall be appointed to hold office for one year, one for 2 years, one for 3 years, one for 4 years, and one for 5 years from the first day of July following their appointments. At the expiration of the term of any director, the mayor or president, with the approval of the corporate authorities, shall appoint a successor, or reappoint that director, who shall hold office for 5 years and until his successor is appointed and has qualified. A majority of the directors, with the consent of the mayor or president and the corporate authorities, may remove any director for misconduct or neglect of duty.
Vacancies in the board of directors, however occasioned, shall be filled in like manner as original appointments. No director shall receive compensation for serving as a director. No director shall be interested in a private capacity, either directly or indirectly, in the purchase or sale of any supplies for the public health board.
65 ILCS 5/11-17-3