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Transcripts for MSNBC All In With Chris Hayes 20210918 00:29:00

Kickback into play and rev up antibody responses when you are reexposed. right. okay. final question then i will let you go. should we anticipate this is going to be like the flu shot where there s yearly, you know, we re getting vaccinated for it routinely or is it more like tetanus? yeah, this is where i think the terminology of booster is wrong. it is really an additional dose. most vaccines are given as two, three or four-dose regimens. so we anticipate that eventually this will be a three-dose regimen. okay. all right. that s helpful. dr. celine gounder, thank you for making time tonight. my pleasure. still ahead, an appalling reminder of the carnage of u.s. counterterror policy as the pentagon finally admits the truth about the drone attack that killed an aid worker and seven kids in kabul. that s next. ayy, ayy, ayy yeah, we fancy like applebee s on a date night ....

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