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Britain and Canada have authorized another round of booster shots for older and immunocompromised citizens. So far, U.S. officials haven’t followed suit.
Duodenoscopes — tubular cameras threaded into the intestine — with disposable parts were supposed to be safer. But the parts can fall off in the body, the F.D.A. warned.
Pfizer’s treatment applies an approach that is different from some other products, which doctors say may make it safer for people at risk of heart attacks or stroke.
The shots, if approved by the agency, would be the first vaccines publicly available against a respiratory virus that kills thousands a year. Some advisers did cite a small but identifiable health risk.
