Others, together with some who’ve been extremely vital of the C.D.C.’s previous faculty steerage, praised the brand new tips.

“For the primary time, I actually suppose they hit it on the nostril,” mentioned Dr. Benjamin Linas, an infectious illness specialist at Boston College. “I believe it’s science-based and proper on the mark.”

Dr. Linas mentioned that he anticipated pushback to the advice that unvaccinated kids put on masks, however that it nonetheless made sense.

“I don’t need to ship my 11-year-old to highschool with no masks but, as a result of Delta is on the market,” he mentioned, referring to the extremely transmissible variant that now causes the majority of cases in the United States. “And even when she’s not going to get extreme Covid from Delta, I’m not able to take that threat.”

Emily Oster, the Brown College economist and creator of parenting books who waded final yr into the contentious debate over school reopenings, utilizing knowledge to argue that kids ought to return to highschool in particular person, mentioned that she was usually happy with the C.D.C.’s framework, which she mentioned gave districts a highway map to reopen with out being too prescriptive.

Although she had pushed for even more relaxed guidance — eliminating the three-foot rule altogether, for instance — she mentioned the brand new suggestions gave districts necessary flexibility.

“That is, in some methods, probably the most optimistic I’ve been about their recommendation,” Dr. Oster mentioned.

Although there are far fewer instances total than throughout the winter peak, together with in kids, they’ve more and more made up a larger proportion of instances because the pandemic has gone on and, just lately, as extra adults have been vaccinated.

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