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flag A rare genetic mutation causes vaccine-induced blood clots by triggering antibodies to attack a human protein, new research finds.

flag A global research team has identified the cause of the rare blood clotting disorder VITT linked to adenovirus-based COVID-19 vaccines: a rare genetic mutation in some individuals causes antibodies to mistakenly attack a human blood protein, PF4, due to molecular mimicry with a viral protein in the vaccine. flag The discovery, published in the New England Journal of Medicine, explains why VITT occurs in about two per 100,000 recipients and offers a clear path to redesign vaccines by modifying the adenovirus vector to eliminate the risk while preserving effectiveness.

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