The highly anticipated approval of one of the COVID-19 vaccines by the U.S. Food and Drug Administration is a game changer for colleges on the fence about whether to require that students or employees be inoculated against the deadly virus.

The full approval of the Pfizer-BioNTech vaccine places that shot on the same level as other vaccines that colleges and universities regularly require. Experts say they expect to see more colleges moving to mandate COVID vaccines in the coming weeks.

When Jane Marcellus, a professor of journalism at Middle Tennessee State University, was denied a request to teach remotely because of COVID-19, she responded with her resignation.

She isn't alone. Several other professors have publicly announced that they’re leaving their institutions or choosing not to teach this term because their colleges and universities are mandating face-to-face instruction despite rising numbers of COVID-19 infections in their areas.