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What to Know About Individuals Getting Rare But Severe Blood Clots from Johnson & Johnson Vaccine

Photo: Jessica Hill/AP, FILE

Six confirmed cases are being studied by the Food and Drug Administration, Centers for Disease Control and Prevention, and Johnson & Johnson. It's not yet known whether the vaccine has a direct causative effect on the clots, but of the more than 7 million people who have gotten the Johnson & Johnson one-dose vaccine, only six cases have been singled out -- about one in a million.

All of the cases ...