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To evaluate an extra booster, U.S. officials looked to Israel, which opened a fourth dose to people 60 and older during the omicron surge. The FDA said no new safety concerns emerged in a review ...

Health officials in the U.S. have authorized a fourth dose of the COVID-19 vaccine to people aged 50 and older. Across Canada, second booster shots aren’t widely available yet, but experts say they...

Daignault points to a 2022 study based on data from Israel, which started giving fourth doses to people 60 to 100 years old in January. “It showed that those with a second booster had a lower...

In short, there is strong evidence that a fourth dose – or second booster – provides meaningful protection among vulnerable populations, including people over 60. So another booster is reasonable for some groups. And while a fourth dose may benefit a select group, it is far more important that people receive their first, second and third doses.

Israel became the first country to administer a fourth dose more widely in January, when it approved the administration of a fourth dose of the BNT162b2 vaccine (Pfizer-BioNTech) to people aged 60 years or older as well as to high-risk populations and health care workers, if more than four months had passed since their third dose.

People ages 12 and up who are immunocompromised and received a Pfizer-BioNtech vaccine can receive a fourth or booster dose three months after their third primary dose. Moderna booster doses are...

The U.S. Food and Drug Administration has so far authorized a fourth shot only for those aged 50 and above, as well as those who are immunocompromised. And the U.S. Centers for Disease Control and...