Participant characteristics
| Healthy volunteers | Myocarditis (baseline) | Myocarditis (3 months) | |
| Number | 10 | 9 | 7 |
| Female | 6 | 1 | 1 |
| Age (years) | 50 (45–53) | 28 (24–34)*** | 25 (23–35) |
| Body mass index (kg/m2) | 26 (23–29) | 25 (22–29) | 25 (22–27) |
| Left ventricular ejection fraction (%) | 61.1±4.1 | 51.0±4.9*** | 57.1±4.3 |
| Late gadolinium enhancement (mL) | Nil | 30.3±19.3 | 16.3±12.3 |
| ECG | n/a | 9/9 | |
| ST elevation | 7 | ||
| T-wave inversion | 1 | ||
| Normal | 1 | ||
| Coronary angiogram | n/a | 4/9 | |
| Normal | 4 | ||
| Echo | n/a | 8/9 | |
| Wall motion abnormality | 4 | ||
| Normal | 4 | ||
| Blood tests | |||
| White cell count (×109/L) | 5.8 (4.2–7.1) | 7.1 (6.1–8.9) | 5.1 (4.6–5.6) |
| Neutrophil count (×109/L) | 3.2 (2.2–4.2) | 4.4 (3.7–5.2)* | 2.8 (2.7–3.5) |
| Lymphocyte count (×109/L) | 1.7 (1.4–2.1) | 1.8 (1.3–2.2) | 1.8 (1.2–1.9) |
| Monocyte count (×109/L) | 0.4 (0.3–0.7) | 0.6 (0.5–0.8) | 0.4 (0.3–0.5) |
| C-reactive protein (mg/L) | 1.0 (1.0–2.5) | 38(14-63)** | 2.0 (1.0–2.0) |
| Troponin (ng/L) | 2.0 {1.5–4.0) | 1 21 842 (3950–25 722)**** | 4.0 (2.0–6.0) |
Mean±SD or median (IQR).
* p<0.05; **p<0.01; ***p<0.001; ****p<0.0001 (compared with volunteers at baseline).