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The record on the j&j shot. what is your read on the effectiveness of the shot, and the booster. and so many people are asking if they can mix brands. if people have had to modernas, can they get a pfizer booster. if people have had one j&j, can they get a moderna booster. can you take that on for us? >> so the data on two doses of j&j, a second dose after the first one is looking really good. protection well into the nineties for severe disease, hospitalization, and death. and also protection a...