Subsequent vaccinations in VITT patients other than SARS-CoV2 vaccination

Introduction Vaccine-induced immune thrombotic thrombocytopenia (VITT) is a rare, but severe side effect after vaccination with adenovirus vector-based vaccines (ChAdOx1 nCoV-19, AstraZeneca and Ad26.COV2.S, Johnson & Johnson/Janssen) in which platelet activating anti-platelet factor 4 (PF4) antibodies cause thrombocytopenia and thrombosis at unusual sites.