of action for a couple of weeks. and more importantly, it then makes you more likely to infect somebody else who may be vulnerable. either unvaccinated or immunocompromised. so everyone who is eligible for a booster should get a booster. >> the cdc's official stance on mixing and matching. so if you got a pfizer vaccine, whether you get the moderna, j&j or pfizer booster, their official stance is we'll not articulate a preference as to whether or not you should stick to the same brand. shouldn't people exercise some discretion? we know, for instance, people who are worried about blood clots with the j&j vaccine, shouldn't they get one of the moderna or pfizer vaccine boosters? and if people have a history of heart inflammation, shouldn't they stay away from moderna or pfizer and get a j&j booster? >> i think the cdc missed yet another opportunity to be clear with the public. what i've been telling my patients is the following. if you haven't had any issues