A pharmacist holds a Pfizer and BioNTech COVID-19 vaccine shot in Portland, Ore. AP FILE

The Food and Drug Administration is scrutinizing the common practice of giving coronavirus and flu shots together, signaling a reversal of years of federal guidance and a broader crackdown on administering multiple vaccines at the same time.

Vinay Prasad, the FDA’s top vaccine regulator, recently announced that his team will require new clinical trials before allowing pharmaceutical companies to claim that coadministering multiple respiratory virus vaccines is safe and effective — a plan that was dismissed by outside experts as unnecessary and potentially counterproductive.

The shift under Prasad, which he described as part of a new “evidence-based philosophy,” could have implications that go beyon

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