It *was* a two-dose vaccine to begin with until they decided to run phase 3 as a one-dose vaccine because they didn’t think it would compete with mRNA without differentiation. And regulators loved it because it was “good enough” and they thought hesitant folks might get 1 dose.
“What the advisors to the FDA felt is that, given the data that they saw, very likely, this should have been a two dose vaccine to begin with," Dr. Anthony Fauci tells @MarthaRaddatz booster shots authorized for Johnson & Johnson vaccine. https://abcn.ws/3j7f4LO pic.twitter.com/KjPQy9ZGg0
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