A lot of people are asking the question, so I think it's useful to point out that a vaccine that prevents 90% of infections would be sufficient for herd immunity in most cases
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Nevertheless, if a vaccine does stop 90% of infections, and we can vaccinate 90%+ of the population, then you'd have about 80% of people immune to the disease which is well above any herd immunity threshold for COVID-19
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It remains to be seen whether Pfizer's vaccine - or any of the other candidates - can meet this fairly high threshold for efficacy, but if they can then yes vaccine-induced herd immunity would certainly be on the table
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Curious, how do we define « infection » ? Can your immune system fight off a virus without an infection in the first place ?
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the distinction is whether the virus starts multiplying significantly if the vaccine stops an innoculum from getting past the nose and throat, so you don't get lung problems or virus in the blood, infection has been prevented
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against infection, or at least onward transmission
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-must be injected and not remain in the vial.
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