His brother came down with pericarditis and myocarditis and ended up in the hospital; His brother came down with pericarditis and myocarditis and ended up in the hospital; This spontaneous case was reported by a patient family member or friend and describes the occurrence of PERICARDITIS (His brother came down with pericarditis and myocarditis and ended up in the hospital) and MYOCARDITIS (His brother came down with pericarditis and myocarditis and ended up in the hospital) in a male patient of an unknown age who received mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) for COVID-19 prophylaxis.     Family history included Atrial fibrillation (Sister had atrial fibrillation (heart flutter).) and Heart rate high (Sister had fast heart beat.).    On an unknown date, the patient received dose of mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (unknown route) 1 dosage form. On an unknown date, the patient experienced PERICARDITIS (His brother came down with pericarditis and myocarditis and ended up in the hospital) (seriousness criteria hospitalization and medically significant) and MYOCARDITIS (His brother came down with pericarditis and myocarditis and ended up in the hospital) (seriousness criteria hospitalization and medically significant). At the time of the report, PERICARDITIS (His brother came down with pericarditis and myocarditis and ended up in the hospital) and MYOCARDITIS (His brother came down with pericarditis and myocarditis and ended up in the hospital) outcome was unknown.            No relevant concomitant medications were reported.  Patient had the original monovalent Moderna vaccine and went to get the Moderna booster dose.  Patient was came down with pericarditis and myocarditis and ended up in the hospital.  No treatment medication reported.  Company Comment: This is a spontaneous case concerning a male patient of unknown age, with no reported medical history, who experienced the serious (due to medically important condition and hospitalization) expected, AESI of myocarditis and pericarditis. The events occurred after the booster dose of mRNA-1273.222 vaccine. Temporal association cannot be assessed due to lack of information on onset date of the events and vaccination date. The outcome of both events was not reported. No further clinical information was available for medical review. The benefit-risk relationship of mRNA-1273.222 vaccine is not affected by this report.   This case was linked to US-MODERNATX, INC.-MOD-2022-653763 (E2B Linked Report).; Sender's Comments: Company Comment: This is a spontaneous case concerning a male patient of unknown age, with no reported medical history, who experienced the serious (due to medically important condition and hospitalization) expected, AESI of myocarditis and pericarditis. The events occurred after the booster dose of mRNA-1273.222 vaccine. Temporal association cannot be assessed due to lack of information on onset date of the events and vaccination date. The outcome of both events was not reported. No further clinical information was available for medical review. The benefit-risk relationship of mRNA-1273.222 vaccine is not affected by this report. US-MODERNATX, INC.-MOD-2022-653763:Several cases of myocarditis and pericarditis