Date	Event
7 days prior to admission	Patient received first dose of COVID-19 vaccination (Pfizer-BioNTech).
Day 1 admission	First symptoms of sharp, positional chest pain (worse on lying flat), shortness of breath, and cough. Presented to the emergency department, electrocardiogram showed sinus tachycardia, with widespread concave ST elevation (lead I, II, III, AVL, AVF, and V2–V6) and reciprocal ST depression. Hospital admission. COVID-19 PCR testing negative.
Day 2 admission	Echocardiography showed 1.1-cm pericardial fluid surrounding the entire heart. Treated with non-steroidal anti-inflammatory and paracetamol. Resolution of symptoms.
Day 3 admission	Discharge from hospital.
7 weeks post-admission	Repeat echocardiogram showed resolution of pericardial fluid.