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Johnson vaccine with another dose of johnson & johnson, or do we get very novel and take on the approach of possibly mixing, giving one of the other vaccines as a boost to the johnson & johnson vaccine recipients? >> there was one study that suggested that changing, if you're j&j, maybe getting one of the other different vaccines, that it would be helpful, maybe even better. do we have enough data on that, sore that just one study? >> you know, it was a very small study. only 450 participants in nine different arms, but very intriguing data. if a person had received the johnson & johnson vacci...

>> right. so up -- up until this point, the 15 million americans who got the one-dose johnson & johnson vaccine really have not gotten any guidance at all. what this study found is that the people who got a second dose of johnson & johnson had a fourfold increase in the neutralizing antibody response. that's very good. but people who got a second dose that's a pfizer vaccine had 35 times the level of neutralizing antibody increase and who got moderna, had a 76fold increase. and so, i think there are a lot of people who got the j&j vaccine who are now going to be wondering should i get the seco...

The people who got a second dose of johnson & johnson had a fourfold increase in the neutralizing antibody response. that's very good. but people who got a second dose that's a pfizer vaccine had 35 times the level of neutralizing antibody increase and who got moderna, had a 76fold increase. and so, i think there are a lot of people who got the j&j vaccine who are now going to be wondering should i get the second dose that's something different than j&j? and again, i know that's something that the fda and cdc will be discussing in detail but this study certainly points in that direction. >> so...