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R21/Matrix-M, developed by the Jenner Institute at Oxford University, uses three doses administered four weeks apart and a booster dose given after one year.

Eligible groups were offered two main doses as a minimum, plus a booster dose, with additional boosters for more vulnerable groups later on in the pandemic.

And California officials require a booster dose for students entering seventh grade.

Similarly, if you qualify but missed an earlier booster dose, you can have another jab this spring to catch up.

Federal health officials say U.S. adults 65 and older who got a shot of the updated COVID-19 vaccine in the fall should get a booster dose now, if at least four months have passed.