55 ILCS 5/2-5020
A majority of the members of any county board shall constitute a quorum for the transaction of business; and all questions, ordinances, resolutions, or motions which shall arise at meetings shall be determined by the votes of the majority of the members present, except in such cases as is otherwise provided.
The county board at any properly noticed public meeting may by unanimous consent take a single vote by yeas and nays on the several questions of the passage of any 2 or more of the designated ordinances, orders, resolutions, or motions placed together for voting purposes in a single group. The single vote shall be entered separately in the minutes under the designation "omnibus vote", and the clerk may enter the words "omnibus vote" or "consent agenda" in the minutes in each case instead of entering the names of the members of the county board voting "yea" and those voting "nay" on the passage of each of the designated ordinances, orders, resolutions, and motions included in the omnibus group or consent agenda. The taking of a single or omnibus vote and the entries of the words "omnibus vote" or "consent agenda" in the minutes shall be a sufficient compliance with the requirements of this Section to all intents and purposes and with like effect as if the vote in each case had been taken separately by yeas and nays on the question of the passage of each ordinance, order, resolution, and motion included in the omnibus group and separately recorded in the minutes. Likewise, the yeas and nays shall be taken upon the question of the passage of any other ordinance, resolution, or motion at the request of any county board member and shall be recorded in the minutes.
55 ILCS 5/2-5020