C.D.C. Says 3 Feet in Elementary Schools With Masks Is O.K. – The New York Times (misleading headlines support public disbelief about everything – thanks but no thanks NYT)

The three-foot rule also now applies to students in middle schools and high schools, as long as community transmission is not high, officials said. When transmission is high, however, these students must be at least six feet apart, unless they are taught in cohorts, or small groups that are kept separate from others.

The six-foot rule still applies in the community at large, officials emphasized, and for teachers and other adults who work in schools, who must maintain that distance from other adults and from students.