There are, of course, HUGE caveats here: - protection must be long-lasting - must protect against infection, not just symptoms - vaccination rate has to be quite high
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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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Those two statements are contradictory. It is rare that a single paper provides a definitive answer to such a broad question. Nevertheless, case numbers for vaccine-preventable disease demonstrate the effect quite well across the world http://www9.health.gov.au/cda/source/cda-index.cfm …
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From what I have understood, the claimed 90% is against COVID-19, not infection from the virus. That is, the reduction is in symptomatic infections.
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Do we know what proportion of truly asymptomatic infections can transmit though? I don’t know if I’ve seen studies on this.
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Considering what we know about immunity, does the speed of spread among the population refusing to be vaccinated at all contribute to the percentage of the population we would need vaccinated? Obviously this alone is a terrible idea.
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