FDA issues new warning on Johnson & Johnson vaccine The agency is looking at about 100 cases of a rare and potentially dangerous neurological condition in people who got the shot. Author: Sarah Hammond Updated: 11:14 PM EDT July 12, 2021 VIRGINIA BEACH, Va. — The FDA just issued a new warning about the Johnson & Johnson COVID-19 vaccine. The agency is looking at about 100 cases of a rare and potentially dangerous neurological condition in people who got the shot. However, the FDA says as of now, it's not entirely clear whether the shot caused the problem. Jacqueline Collins’ doctor cleared her to get her COVID-19 vaccine.