myocarditis; this case was received via regulatory authority (reference number: gb-mhra-adr 26654233) on 27-feb-2022 and was forwarded to moderna on 27-feb-2022. this regulatory authority case was reported by a physician and describes the occurrence of myocarditis (myocarditis) in a 24-year-old male patient who received mrna-1273 (moderna covid-19 vaccine) (batch no. 000050a) for an unknown indication. no medical history information was reported. on 10-feb-2022, the patient received dose of mrna-1273 (moderna covid-19 vaccine) (unknown route) 1 dosage form. on 15-feb-2022, after starting mrna-1273 (moderna covid-19 vaccine), the patient experienced myocarditis (myocarditis) (seriousness criterion hospitalization). on 19-feb-2022, myocarditis (myocarditis) had resolved. for mrna-1273 (moderna covid-19 vaccine) (unknown), the reporter did not provide any causality assessments. no concomitant medication was reported. no treatment medication was reported. the patient had chest pain after moderna vaccination. troponin rise to 1400 settled with colchicine. admitted 2 days. normal echo. the reaction did not occur as a result of mistake made in the administration of the vaccine. company comment: this is a regulatory case concerning 24-year-old male patient with no medical history reported, who experienced the serious expected event of myocarditis which led to hospitalization. the event occurred 5 days after the dose of mrna-1273. the patient had chest pain after moderna vaccination. troponin rise to 1400 and was treated with colchicine. patient's echocardiogram was normal. the outcome for the event was resolved. the benefit-risk relationship of mrna-1273 is not affected by this report.; sender's comments: this is a regulatory case concerning 24-year-old male patient with no medical history reported, who experienced the serious expected event of myocarditis which led to hospitalization. the event occurred 5 days after the dose of mrna-1273. the patient had chest pain after moderna vaccination. troponin rise to 1400 and was treated with colchicine. patient's echocardiogram was normal. the outcome for the event was resolved. the benefit-risk relationship of mrna-1273 is not affected by this report