| Biology | Results | Frequency (n =453) | % |
| White blood cells | Hyperleukocytosis | 160 | 35.5 |
| Leukopenia | 83 | 18.4 | |
| Normal | 208 | 46.1 | |
| PCR | Positive | 380 | 83.9 |
| Negative | 73 | 16.1 | |
| Type of infection | Virus | 69 | 15.2 |
| Bacteria | 73 | 16.1 | |
| Co-infection | 238 | 52.5 | |
| Type of co-infection | Virus/virus | 10 | 2.2 |
| Bacteria/bacteria | 16 | 3.5 | |
| Virus/bacteria | 212 | 46.8 |