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Protein Interaction Causing Rare But Deadly Vaccine-Related Clotting Found
(www.birmingham.ac.uk)
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That seems more a communication problem than a vaccine problem though. I don't have any concept of the what happens if a second dose is taken too soon, but one of the first things that happens when they give one is typically a speech of what to do, not to do, and when to come back for a follow-up. If that didn't happen or wasn't heeded then someone dropped the ball.