“I Am Now a Part of the Clinical Trial” – 22-Year-Old Woman Develops Pericarditis One Week After Receiving Second Dose of the Moderna Vaccine Monday, February 28, 2022 By Stillness in the Storm Leave a Comment (Jim Hoft) A healthy 22-year-old woman was diagnosed with pericarditis, the swelling and irritation of the thin saclike membrane surrounding the heart, following her second dose of Moderna vaccine.