category five. and that's where we have been with this so far. now, we are learning it certainly seems to be as contagious or may be as contagious as people were beginning to worry about. but i think the question on people's minds is what does that mean? does it cause worst disease and in whom? >> the person in minnesota who was infected with omicron variant had a mild case of covid. got two vaccine doses, and a booster dose. in the uk, of the 22 confirmed cases of omicron, 14 people had received at least two doses of vaccines. is -- is that a concern? i mean, mild cases, as far as we know, um, at least on the one hand, the u.s., does that tell you that the vaccines are working? does it tell you what? >> these anecdotes are difficult to parse out. not all anecdotes are symmetric. there is a little bit of asymmetry. if we were to hear we had a lot of icus full of people who had been boosted and on ventilators, i think a small number of cases would alarm us. so right now, it is too soon to