According to a statement from the U.S. Centers for Disease Control and Prevention (CDC), most of the cases were in men, many of whom were 50 or older. It did not find higher than expected cases of GBS in recipients of the mRNA-based vaccines from Pfizer Inc
(PFE.N)/BioNTech SE and Moderna Inc.
(MRNA.O)
Last week, European regulators recommended a similar warning for AstraZeneca's COVID-19 shot, which is based on a similar technology as Johnson & Johnson's vaccine.
The warning is another setback for the J&J shot, which was supposed to be an important tool for vaccinating in hard-to-reach areas and among those hesitant to be vaccinated because it requires only one shot and has less stringent storage requirements than the Pfizer or Moderna vaccines.
But use of the vaccine has already been linked to a very rare, potentially life threatening blood clotting condition and slowed by production problems at the main plant where it is being made.
U.S. regulators decided in April that the vaccine's benefits outweighed the risk from the blood clotting issue.
The warning was first reported by the Washington Post on Monday.
Reporting by and Michael Erman in New Jersey; Additional reporting by Lisa Lambert in Washington and Trisha Roy in Bengaluru Editing by Chris Reese, Peter Graff and Sonya Hepinstall