F.D.A. Will Attach Warning of Rare Nerve Syndrome to Johnson & Johnson Vaccine

The Food and Drug Administration is planning to warn that Johnson & Johnson’s coronavirus vaccine can lead to an increased risk of a rare neurological condition known as Guillain–Barré syndrome, another setback for a vaccine that has largely been sidelined in the United States because of manufacturing problems and a temporary safety pause earlier this year, according to several people familiar with the plans.

Although regulators have found that the chances of developing the condition are low, they appear to be three to five times higher...

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