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Good against delta. so i'm very concerned and i do support the recommendations that even if you had covid, you need to get vaccinated as well. >> it's a very important point. i hear that all the time. hey, i had it, man, i'm good, i got the antibodies. you're saying not anymore. >> i'm saying, you know, we don't have perfect evidence. among the things i would like the cdc to come out with is how many people in the hospital who have died had covid beforehand. that's a really important bit of information. but based on the laboratory data and looking at people over time, i would be very concerned...

We received a lot of questions about the j&j vaccines. people are worried. should they be? >> that's one much my most frequently asked question. the answer is we don't have clinical data against the delta variant or at least not that has been publicly made available. we have laboratory data showing that people who have virus neutralizing antibiotics to the single dose j&j vaccines have some virus neutralizing antibiotics against the delta variant, but it's way down compared to the earlier lineages like the u.k. variant. and when i look at the numbers. >> and they are small numbers, one has ser...

Antibodies wane, we know it happens even in people who had prior covid, i think that the vaccines will actually last for a full year. the most important thing is if you're not vaccinated, get vaccinated. that is what's going to protect you against these contagious strains. >> so why would pfizer think a booster was needed and the cdc not? >> well, you know, i definitely am thankful to pfizer for the vaccines they have given. in fact, over half of the adults in america have gotten the pfizer shots. we know these mrna vaccines work well. but pfizer is a pharmaceutical company. they're looking at...

In other words, the laboratory data that indicate that if this is the level that you need, and you are up here, how long does it take for you to start going back down and getting below the protective level? that's called a correlative immunity. the other element you follow is if you start to see more breakthrough infections among people who are vaccinated. in other words, not as much protection as you were getting. whether that's going to be a year from now or 18 months, we don't know. but the one thing we are doing, rachel, we're taking it very seriously, and we're doing the clinical trials r...

Family. love your friends. love your neighbors, love your elders, love the people in your life. those are the people you need to do this for. in some cases, that is an easier sell. on vaccines, do you think that we will need booster shots this year? do you think that is something on the distant horizon? or do you think that is something we should be thinking about in 2021? >> i don't know, to be quite honest with you, rachel. i don't know. i believe that sooner or later, we will need a booster. because the immunity might wane and start to trickle down. i don't know right now. none of us know w...