Researchers have pinpointed the molecular trigger behind vaccine-induced immune thrombocytopenia and thrombosis (VITT) associated with adenoviral vector COVID-19 vaccines. This response mistakenly targets platelet factor 4 (PF4), a crucial blood protein, due to antibodies that recognize the adenoviral core protein VII (pVII). Their study utilized advanced techniques like mass spectrometry and immunogenetic sequencing to clarify how this immune response occurs, with implications for safer vaccine design in the future.

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