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Continue to ChatAstrazeneca Vaccine Efficacy : Did AstraZeneca use outdated information in vaccine study ... : The safety and efficacy analysis of the astrazeneca vaccine, published monday, was based on 32,449 participants across 88 trial centers in the u.s., peru and chile. - https://fasihuyh.blogspot.com/2021/04/astrazeneca-vaccine-efficacy-did.html