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now says federal officials have identified about 100 suspected cases of guillain-barre syndrome. gbs is a neurological disorder in which the body's immune system damages nerve cells, causing muscle weakness, or in severe cases paralysis. >> that message about these side effects being exceptionally rare, frankly, it has not gotten through to people and we run the risk here if we don't pivot quickly away from j&j of having a sustained carryover effect, really damaging the reputation and the image of the mrna vaccines >> reporter: the gbs cases occurred about two weeks after receiving the j&j shot, mostly among many, many over age 50 most people who contract gbs recover still, the fda warning is the latest blow for a vaccine that has been highly anticipated because it was easier to administer it requires only one dose and can be stored at a higher temperature. but in april the cdc said it had identified rare but serious blood clots linked to the j&j vaccination. tonight the company says it's working with federal regulators, that the chance of