Okla. Stat. tit. 70, § 1210.193

The immunizations will be administered by a licensed physician, someone under his direction, or public health department. If the parents or guardians are unable to pay, the State Department of Public Health shall provide, without charge, the immunization materials required by this act to such pupils. The parents, guardian or person having legal custody of any child may claim an exemption from the immunizations on medical, religious or personal grounds.