The Centers for Disease Control and Prevention is reversing course on some masking guidelines.

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The agency announced new recommendations Tuesday that even vaccinated people should return to wearing masks indoors in parts of the U.S. where the coronavirus is surging.

Scientists cited new information about the ability of the delta variant to spread among vaccinated people.

The CDC also recommended indoor masks for all teachers, staff, students and visitors to schools, regardless of vaccination status.

The new guidance follows recent decisions in Los Angeles and St. Louis to revert to indoor mask mandates amid a spike in COVID-19 cases and hospitalizations that have been especially bad in the South.

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.