WASHINGTON (AP) — Government advisers are debating whether to recommend extra doses of the Pfizer vaccine, a key step toward the Biden administration's plan to dispense COVID-19 booster shots to most Americans.

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Scientists inside and outside the U.S. government have been divided in recent days over the need for boosters and who should get them.

A panel of Food and Drug Administration advisers will vote Friday on the safety and effectiveness of boosters.

If the FDA approves the extra doses a separate committee convened by the Centers for Disease Control and Prevention will debate who should get boosters and when.

LOOK: Answers to 30 common COVID-19 vaccine questions

While much is still unknown about the coronavirus and the future, what is known is that the currently available vaccines have gone through all three trial phases and are safe and effective. It will be necessary for as many Americans as possible to be vaccinated in order to finally return to some level of pre-pandemic normalcy, and hopefully these 30 answers provided here will help readers get vaccinated as soon they are able.