booster shot. that's case numbers reported in that population. their numbers are not going up at all. it's flat. flat, flat. that is boosted nursing home residents. about half of all nursing home residents in the u.s. have been boosted. imagine if they all were. that is about as blunt of a case as i can make for why people ought to get booster shots. certainly in nursing homes. but presumably, you can extrapolate to the broader population from that. we're being told by the experts now that boosters are apparently our best defense against the omicron variant about which there has been a ton of news today. joining us now is dr. david kessler. he's helped guide us on the show through questions like this many times before. as you know, he's the top science adviser to the biden administration's covid response.