MENDON, Mass. (AP) — A Boston hospital is defending itself after a man’s family claimed he was denied a new heart for refusing to be vaccinated against COVID-19.

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Brigham and Women’s Hospital declined to comment on D.J. Ferguson’s case but says most transplant programs set similar requirements to improve patients’ chances of survival.

Ferguson’s family says hospital officials told the 31-year-old father of two he was ineligible for a heart transplant because he hasn’t been vaccinated against COVID-19.

His mother told The Associated Press on Wednesday that her son has had other immunizations in the past but has concerns about possible COVID-19 vaccine side effects.

Answers to 25 common COVID-19 vaccine questions

Vaccinations for COVID-19 began being administered in the U.S. on Dec. 14, 2020. The quick rollout came a little more than a year after the virus was first identified in November 2019. The impressive speed with which vaccines were developed has also left a lot of people with a lot of questions. The questions range from the practical—how will I get vaccinated?—to the scientific—how do these vaccines even work?

Keep reading to discover answers to 25 common COVID-19 vaccine questions.