experts over whether there is a safety cost. the trouble is for the unvaccinated, the data doesn t really back up that they become noninfectious at five days. reporter: the isolation guidance doesn t differentiate between the vaccinated and the unvaccinated. it does say everyone should mask up for five days following isolation. and there s mounting pushback from union leaders from nurses this is when you should be tightening your controls, not lessening them. to flight attendants. the cdc should be loud and clear about impleltation here because no workers should be forced to come to work when they re still sick and that is what i believe we ll see here. we re very concerned about that. the wave of infections sweeping the country causing staffing shortages and forcing cancellations of thousands of flights during the busy holiday period. apple closing its new york city stores for browsing.