Should colleges require students to get the COVID vaccine?

California’s two major university systems announced last week that they will require all students, faculty and staff to be vaccinated against COVID-19 before they return to campus in the fall. The University of California and California State University systems — with more than 760,000 students across dozens of campuses — are the latest schools to join a growing list of colleges that will mandate vaccinations at the start of the next academic year.

Vaccine requirements are far from universal, however. The University of Louisiana system will encourage students to get...