a national guard to step in if necessary. the state s health commissioner hoping that won t be the case. we are looking at really having so many of our people vaccinated that that will not be necessary. but at this point things are still being tabulated. reporter: in new york city fears of a staffing shortage in the largest school district in america. all teachers must be vaccinated tomorrow. no testing option. some 10,000 employees may not be allowed to work. the mayor says substitutes are standing by and most teachers are vaccinated. a 93% of our teachers, 98% of our principals. the bottom line is this mandate has worked. reporter: this teacher won t be showing up tomorrow. now you re taking away their teachers, their go-to person. reporter: she says she had asymptomatic covid the spring of last year i had many doctors say to me you don t need it right now. maybe in the future. reporter: while the white house covid-19 data director says today saw the highest