Frequency of positive anti-PF4/polyanion antibody tests after COVID-19 vaccination with ChAdOx1 nCoV-19 and BNT162b2 | Blood | American Society of Hematology

Key Points. Low titer PF4/polyanion antibodies occur after vaccination with ChAdOx1 nCoV-19 and BNT162b2These PF4/polyanion antibodies do not activate platelets

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