they re sending mixed messages constantly. reporter: as americans and elected leaders struggle to find common ground over simple health measures which is it, vaccines or masks? the vaccines work or don t roar. reporter: today those announcing the change defend their decisi would no longer need masks. something has changed, and what has changed is the virus. reporter: the delta variant is driving covid clusters in every day. the attorney general in missouri says he ll sue to overturn kansas city s adoption of the new cdc guidelines. just as hospitals and hot spots nationwide are on the brink of crisis again. we are full, full, full. and it s scary. reporter: as major employers like google and facebook announce today vaccine requirements for those returning to the office, new york city says they ll soon pay people $100 to get vaccinated. if we get people vaccinated who are not yet vaccinated, if we