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The U.S. is getting another COVID-19 vaccine choice as the Food and Drug Administration on Wednesday cleared  shots for adults.

Novavax makes a more traditional type of shot than the three other COVID-19 vaccines available for use in the U.S. -- and one that’s already available in Europe and multiple other countries.

Nearly a quarter of American adults still haven’t gotten their primary vaccinations even this late in the pandemic, and experts expect at least  to roll up their sleeves for a more conventional option — a protein-based vaccine.

The Maryland company also hopes its shots can become a top booster choice in the U.S. and beyond. Tens of millions of Americans still need boosters that experts call critical for the best possible protection as the coronavirus continues to mutate.