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The FDA declines to take a stance on efficacy of Pfizer booster

The FDA has decided not to take a stand on the efficacy of a booster shot from Pfizer. The agency says it doesn't have enough data to make a decision, and that it's only seen an observational study in Israel. Observational studies do not adhere to the same formal standards as clinical trials.
Wed, Sep 15 20216:26 PM EDT