F.D.A. Attaches Warning of Guillain-Barré Syndrome to Johnson & Johnson Covid Vaccine July 12, 2021 +4 and that the benefits of the vaccine still strongly outweigh it. Federal regulators concluded that the risk of developing the syndrome was low IFTTT NYT NYT > Business NYTimes and that the benefits of the vaccine still strongly outweigh it. Federal regulators concluded that the risk of developing the syndrome was low IFTTT NYT NYT > Business NYTimes