The US Centers for Disease Control and Prevention announced Thursday that people fully vaccinated against Covid-19 no longer need to wear masks or practice social distancing indoors or outdoors, in most circumstances.

"First of all, the schools should be open, face-to-face, in-person classes in the fall," Fauci told CNN's Wolf Blitzer. "We absolutely have to do that."

In those situations, children who are not vaccinated ­— and most elementary school students won't be — should wear a mask, Fauci, director of the National Institute of Allergy and Infectious Diseases, said. Earlier Friday, he said that elementary school children likely won't be vaccinated until the end of the year.