Section 110 ILCS 20/3 - Exceptions(a) The provisions of this Act shall not apply to: (1) persons enrolled in a post-secondary educational institution on or before the effective date of this Act; (2) persons enrolled less than half-time during a term or semester; or (3) persons whose instruction solely involves research, field work or study outside of a classroom environment.(b) No proof of immunization shall be required if a physician licensed to practice medicine in all of its branches certifies that any immunization required by the Department is medically contraindicated.(c) No proof of immunization shall be required if the person or his or her parent or guardian presents a signed statement that he or she objects to immunizations on religious grounds.(d) The certificate of medical exemption or statement of religious objection required by this Section shall be presented to the post-secondary educational institution.