Background: Several cases of adverse reactions following vaccination for coronavirus disease 2019 (COVID-19) with adenoviral vector vaccines or mRNA-based vaccines have been reported to date. The underlying syndrome has been named "vaccine-induced immune thrombotic thrombocytopenia" (VITT) or "thrombosis with thrombocytopenia syndrome (TTS)" with different clinical manifestations.
Methods: We report the clinical course of five patients who had severe adverse reactions to COVID-19 vaccines, either with VITT/TTS, abdominal or pulmonary thrombosis after adenoviral vaccines, or Stevens' Johnson syndrome because of mRNA vaccination, all of whom required admission to the intensive care unit (ICU).
Conclusions: All patients with severe or life-threatening suspected reaction to different types of COVID-19 vaccination required ICU admission. A prompt evaluation of early symptoms and individualized clinical management is needed to improve outcomes.
Keywords: COVID-19; coronavirus disease 2019; thrombosis with thrombocytopenia syndrome; vaccine-induced immune thrombotic thrombocytopenia; vaccines.
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