the level of laboratory-projected protection. this is good news about the booster protection. reporter: early results from pfizer found that high levels of antibodies from a booster may better defend against omicron. but when the standard two-dose vaccine took on the new variant, antibody levels dropped 25 times lower. pfizer saying two doses may not stop infection, but are still likely effective in preventing severe disease. people should go get their third dose now, not wait. reporter: pfizer s data coming on the heels of a small study out of south africa that also found omicron appeared to chip away at two doses of the vaccine. here in the u.s., cases of omicron have been detected in at least 21 states. our dr. jen ashton today, getting a rare look inside the cdc s war room where scientists are tracking omicron across this country. taons.he these are all the mutations.