Table 1.

Summary of clinical findings. All patients presented 2 to 5 days following their 2nd vaccine dose with troponin and CRP elevation, and the viral serologies that were tested were negative. ECG and TTE abnormalities may be compared as well.

Case number	Age and sex	Vaccine maker	Days from 2nd vaccine dose to presentation	Peak troponin-I (pg/mL)	CRP (mg/L)	Viral serologiesa	ECG abnormalities	TTE findings
1	23F	Moderna	5	16,263	41	Negative	Down-sloping PR depressions, diffuse ST elevations	LVEF 55–60%, basal inferior and basal inferolateral hypokinesis
2	20M	Moderna	2	>27,000	88	Negative	Down-sloping PR depressions, diffuse ST elevations	LVEF 45%, apical septal hypokinesis
3	29M	Moderna	4	6802	14	–	Down-sloping PR depressions, diffuse ST elevations	LVEF 55%, no regional wall motion abnormalities
4	30M	Pfizer	4	2518	129	Negative	T-wave inversions in lateral leads	LVEF 65–70%, no regional wall motion abnormalities

CRP: C-reactive protein.

ECG: electrocardiogram.

TTE: transthoracic echocardiogram.

LVEF: left ventricular ejection fraction.

^aCoxsackie virus, EBV, CMV.