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Sick. the cdc also recommending that students sit three feet apart in those classrooms when theyre there in person. cdc director walensky talked about this omicron wave, and how those -- some early research shows that those who have been infected with the delta variant may have some -- or those who have been infected with the omicron variant may have protection against the delta variant but it doesnt go both ways. if youve had the delta variant you can still be susceptible to omicron. >> liz, in...