thinking of how do we live with covid? reporter: the vast majority of schools throughout the country are pressing on and keeping students in the classroom. what we ve learned over the past two years is that there s significant risk keeping children out of school. reporter: but, according to the data company burbio, more than 3200 schools are going remote or delaying returns from winter break. l.a. unified school district, the tleeft push back its start date by one day and require proof of a negative test. in chicago, the powerful teachers union is threatening a walkout over decisions to bring students back to the classroom. contact tracing and vaccination efforts by her administration have been an abject failure. reporter: across the country, pediatric hospitalizations are still rare but now at a record high, spurring questions over whether children are being hospitalized for covid or with covid. as well as questions about the impact of omicron on children. now those childr