sick. the cdc also recommending that students sit three feet apart in those classrooms when they're 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 doesn't go both ways. if you've had the delta variant you can still be susceptible to omicron. >> liz, interesting information there. i really appreciate that. i'm going to leave that there for a second. i want to bring in dr. gerald harmon, the president of the american medical association, your organization made a few headlines this week when you called out the cdc and their shifting covid guidance. you said, quote, potentially hundreds of thousands of people could return to work, and school. infectious, if they follow the cdc's new isolation protocols. you also called them confusing. yesterday on the "today" show