third shot boosters for so much of the population. a large proportion, even of nursing home residents have not gotten their booster doses so i would really like for us to focus on third doses and also reassuring people who are vaccinated and boosted, chances are if they are generally healthy they are going do just fine with omicron so on an individual level someone who is vaccinated and boosted should not be fearing omicron. on the other hand, we as a society should fear omicron because of the potential to strain our health care system and when our hospitals are full, we also have care compromise for patients coming in with strokes, car accidents, heart attacks and other medical emergencies, too. >> speaking of omicron, let's circle back to elizabeth's reporting. two new studies show that this variant is less likely to cause severe disease and hospitalization compared to delta but u.s. officials are still cautious about jumping to conclusions here. why can't we be sure yet? >> the issue is we don't know