forfeit the world juniors tournament. the cdc's latest guidance aims to put people back to work more quickly but the recommendation to isolate for five days, instead of ten if infected but not symptomatic comes, also, with criticism. >> trouble is for the unvaccinated, the data doesn't really back up that they become noninfectious at five days. >> reporter: testing lines across the country are still intolerably long in too many places and frustration is mounting over failures to make more at-home tests available more quickly. >> i hope we fix it in january and february. but we're going to have to have a really effort to make sure there's plentiful, cheap, ubiquitous testing everywhere in the country. that's where we should be in this pandemic right now. >> reporter: those tests, so extremely critical for so many things. they are also a key tool to helping keep more kids in school. new york city schools, the largest district in the nation, announcing today that they plan to return kids to the classroom as scheduled after the winter