According to the company, without information on D-dimer levels, which is linked to blood clots, anti-PF4 antibodies and platelet counts, algorithms developed to identify events based on the existing case definitions will only be able to measure the incidence of simultaneous occurring thrombosis and thrombocytopenia rather than true vaccine associated TTS rate in RWD. The gene discussed is PF4; the disease is deep vein thrombosis.