By CBSBoston.com Staff

CAMBRIDGE (CBS) — The FDA on Friday authorized Moderna and Pfizer’s COVID vaccine booster shots for all adults 18 and older.

A few hours later, CDC vaccine advisers voted unanimously to recommend allowing the booster shots for all, and CDC Director Rochelle Walensky endorsed the advisory committee’s decision to formally expand eligibility.

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Massachusetts and some other states have already declared that adult residents can get a booster shot if it’s been at least six months since their last Moderna or Pfizer dose, or two months since their Johnson & Johnson vaccine shot.

“This emergency use authorization comes at a critical time as we enter the winter months and face increasing COVID-19 case counts and hospitalizations across the country,” Moderna CEO Stéphane Bancel said in a statement. “We thank the FDA for their review, and are confident in the robust clinical evidence that a 50 µg booster dose of mRNA-1273 induces a strong immune response against COVID-19.”

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Dr. Paul Sax, director of the infectious diseases clinic at Brigham & Women’s Hospital, said he is “strongly encouraging” people who are eligible for a booster to get one.

“It’s now clear that getting a third dose – I like to say third dose rather than booster – is really a good way of making the vaccines just as effective as they were the first month or so after you get them,” Sax said.

Massachusetts residents can use vaxfinder.mass.gov to find a full list of locations to receive a booster.

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For more information on the booster program, visit the state’s website.

CBSBoston.com Staff