Binding of CXCL4(PF4) to heparin is well established as a mechanism for inducing autoantibodies to CXCL4(PF4)/heparin in HIT2 and has been proposed as a mechanism by which SARS‐CoV‐2 infection might induce thrombocytopaenia.17 Here, PF4 is linked to Thrombocytopenia.