Introduction The etiology of myocarditis often remains undetermined. A large variety of
infectious agents, systemic diseases, drugs, and toxins can cause the disease. We report the
case of a 19-year-old man who developed myocarditis three days after Pfizer-BioNTech
COVID-19 booster vaccination. Case report A 19-year-old man, presenting with troponin-
positive acute chest pain, was referred to our department. He had received the Pfizer-
BioNTech COVID-19 vaccine three days prior to his admission. The diagnosis of acute …