re: Pfizer data suggest third dose of Covid-19 vaccine ‘strongly’ boosts protection (Delta)

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As a physician, why would a booster being needed surprise you?

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At intervals of a year or less? In part because Pfizer's CEO was pinning for them nearly from the outset. As it turns out, there is little solid evidence of loss of immunity after a year or more, partly because the shots haven't been around that long.