Comparison of patients with short and long incubation periods
| Short incubation period# | Long incubation period¶ | p-value | |
| Patients n | 25 | 20 | |
| Incubation period days | 2 (0–4) | 13 (9–17) | <0.001 |
| Age years | 51 (36–63) | 54 (46–65) | 0.784 |
| Critical cases | 7 (28.0) | 8 (40.0) | 0.396 |
| Viral load in early stage of illness+ | 27.8 (22.6–34.9) | 27.0 (24.1–30.1) | 0.599 |
| Days post exposure when antibody converted | 13 (9–15) | 21 (17–25) | <0.001 |
| Days post onset when the antibody converted | 10 (9–12) | 7 (6–10) | 0.013 |
Data are presented as median (interquartile range) or n (%), unless otherwise stated. #: 0–5 days; ¶: 6–23 days; +: measured using the cycle threshold value of real-time reverse transcriptase PCR when detecting the first available sputum samples collected after onset.