peole are often shedding virus even before they have symptoms and, therefore, are contagious, and people are contagious mostly for the two or three days after they start having symptoms, not so much six, seven, eight, or nine days afterwards. >> reporter: but there's some pushback from the association of flight attendants, which says it could create an unsafe work environment which will cause a much greater disruption than any staffing shortage. one immediate concern is the impact of all those holiday get-togethers. >> omicron is so highly transmissible, that i've been advising people, if you don't have to have a new year's party this year, or you can delay it a few weeks, that might make a big difference. >> reporter: adding to all this worry, the flu is making a comeback this winter. the c.d.c. said today hospitalizations are up, and two children have died from the flu so far. of major. >> garrett: with the hard numbers and the key realities, nikki battiste, thank you so much. with the rise in cases in both