There is not any data on the prevalence of vaccine guilt, but Dr. Matthew Wynia, director of the Center for Bioethics and Humanities at University of Colorado’s Anschutz campus, surmises that many people who have already received the COVID-19 vaccine probably feel like their doses could have gone to someone more deserving. “I think it’s a really common phenomenon,” he says. Wynia would know: He too experienced guilt when he got vaccinated in December, an opportunity afforded by chance.