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I will try here to sketch an answer starting from where @MattDMo left off. Question: How do we evaluate possible long-term side effects of a vaccine? (With specific application to the recently authorized vaccines for SARS-CoV-2). Phase IV clinical trials As @MattDMo has pointed out, the definitive answer can be given only in the Phase IV of the clinical ...


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You are correct that we have been creating and approving vaccines for a very long time, so the procedures for looking at efficacy and side effects of vaccines in general long-term are quite well developed. They occur via so-called "Phase IV" trials, also known as post-marketing surveillance. However, one complicating factor with at least the Pfizer/...


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