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Delta variant and you're looking at different age groups, 18 to 55 and 65 to 85. just concentrate for a moment on the blue. one month after dose two the titer was 241. it went up dramatically after dose three to 1,321. if one looks at the 65 to 85 it wept from 123 to 1479. that's laboratory data. let's look at clinical data. this is a study recently published in the "new england journal of medicine." in israel people aged 60 years or older who received a second dose of mrna at least five months earlier. 12 days or more after the third shot booster dose the rate of confirmed infection was lower...

So, therefore, which populations would benefit from an additional dose? >> so people that are over 65 are recommended to get a booster shot starting soon, i think, and that's going to be available. i guess i didn't quite understand as i was tracking this the source. it seemed like there was an intense controversy and a fight happening inside the government, right? you've got two fda people who even resigned over it when joe biden came out in august saying this is going to be our plan. i guess i just didn't quite understand what the stakes of that fight were. is this just like people had differ...

Looking at here. it's a small study. they basically are measuring antibody levels. so, this is a laboratory study. so they're basically in the lab saying, okay, when we expose to this virus with this vaccine, how much antibodies do we get? how much do we get if we give a booster six months later. the antibodies increase nine fold compared to where they were 28 days after the first shot. so, that's a pretty significant increase. and i think it's probably going to be enough for johnson & johnson if this data is vetted and holds up to make the case that people should get boosters around the count...

Finally, come down, people on the other side of it that haven't been infected say, oh, well, i -- i missed it. i'm not going to get it. i made it through. you know, you can't run out the clock on this one. eventually, as was in your lead, this virus will find you. it is that infectious. so if it's not this surge, it'll be the next surge. and i think that that's an important message is that don't try to run out the clock. it won't happen. please, get vaccinated. >> dr. hotez, we got a lot of viewer questions i want to get to. marcy asks everyone talks about pfizer and moderna vaccines. what abo...

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 that natural immunity, particularly against delta, wanes. remember, we have to get vaccinated against flu every year not because our immunity is so bad, but because the virus changes. and delta is a whole new ball game. it is a changed virus that is very dangerous and very deadly. we can end this all by ge...