WASHINGTON (AP) — U.S. health officials have announced plans to dispense COVID-19 booster shots to all Americans to shore up their protection amid the surging delta variant and evidence that the vaccines’ effectiveness is falling.

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The plan, as outlined by the director of the Centers for Disease Control and Prevention and other top health authorities, calls for booster doses eight months after people get their second shot of the Pfizer or Moderna vaccine.

The booster doses could begin the week of Sept. 20.

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.