745 ILCS 70/13.5
It is not a violation of this Act for any person or public official, or for any public or private association, agency, corporation, entity, institution, or employer, to take any measures or impose any requirements, including, but not limited to, any measures or requirements that involve provision of services by a physician or health care personnel, intended to prevent contraction or transmission of COVID-19 or any pathogens that result in COVID-19 or any of its subsequent iterations. It is not a violation of this Act to enforce such measures or requirements. This Section is a declaration of existing law and shall not be construed as a new enactment. Accordingly, this Section shall apply to all actions commenced or pending on or after the effective date of this amendatory Act of the 102nd General Assembly. Nothing in this Section is intended to affect any right or remedy under federal law.
745 ILCS 70/13.5