Table 1.
Epidemiological data and clinical manifestations
| BACM cases, n | 65 |
| Gender, n (%) | |
| Male | 43 (66.2) |
| Female | 22 (33.8) |
| Age, years | |
| Median (IQR) | 6.5 (4.9–9.1) |
| Ethnicity, n (%) | |
| Caucasian | 45 (70) |
| Asiatic | 7 (10.7) |
| Hispanic | 8 (12.3) |
| African | 5 (7) |
| Season of admission, n (%) | |
| Winter (December–March) | 45 (69.2) |
| Spring (March–June) | 3 (4.6) |
| Summer (June–September) | 6 (9.2) |
| Autumn (September–December) | 11 (16.9) |
| Prodromal symptoms, n (%) | |
| Fever | 49 (75.3) |
| Cough | 21 (32.3) |
| Coryza | 17 (26.1) |
| Sore throat | 17 (26.1) |
| Nausea | 9 (13.8) |
| Vomiting | 10 (15.3) |
| Asthenia | 29 (44.6) |
| Presenting symptoms/signs, n (%) | |
| Bilateral calf pain | 65 (100) |
| Gait complaint | 9 (13.8) |
| Refusing to walk | 61 (93.8) |
| Generalized myalgia | 3 (4.6) |
| Gastrocnemius–soleus tenderness | 62 (95.4) |