Important caveat from @DhruvKhullar: "we know for sure that the vaccines...prevent severe illness in almost all people who are inoculated...we’re not yet certain that the vaccines can prevent people from becoming infected or infecting others."https://www.newyorker.com/science/medical-dispatch/how-getting-vaccinated-will-and-wont-change-my-behavior …
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They have that little bit of one month data for PCRs at Dose 2, so perhaps they are referring to the seroconversion rate after a few months. That's a pretty good measure of infection, but not technically secondary transmission. Unless they are doing stealth contact tracing!
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Having said that though - if tremendous efficacy against all infections including asymptomatic, it's true that secondary transmission would be vanishingly small.
End of conversation
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