Data compiled by the medical freedom group No College Mandates includes Harvard University and prestigious medical school Johns Hopkins University among the 68 institutions of higher learning.

Exactly how stringent those mandates may be can vary from school to school. Harvard says it is required for “all students who will be on campus” and that “registration holds [for classes] will be automatically applied” who “fall[s] out of compliance at any time for any of the required immunizations.” (Students can apply for medical or religious exemptions, however.)

Johns Hopkins requires vaccination of anyone studying or working on-site, and those who do not comply “may be denied access to Johns Hopkins property and electronic resources” or “subject[ed] to disciplinary action under the Student Conduct Code or the appropriate procedures applicable to faculty and staff.” Fully-remote students or employees are exempt, and there is an application process for medical and religious exemptions.