Table 1.
Comparisons of clinical and epidemiological features between A(H7N9) and A(H5N1) infections in humans16, 34, 43
| A(H7N9) (n = 139)34 | A(H5N1) (n = 907)16 | |
|---|---|---|
| Median age (years) | 61 (2–91) | 19 (5–32) |
| Male (%) | 71 | 431 (47) |
| Co‐morbid illness | 79/108 (73%) | 5/41 (12%)43 |
| Urban residence | 101 (73%) | 19 (44%)43 |
| Rural residence | 38 (27%) | 24 (56%)43 |
| Exposure to poultry | 82% | 82.5% |
| Occupational exposure to poultry | 9 (6%) | 15 (1.7%) |
| Visited wet poultry markets | 70/107 (65%) | 82/907 (9%) |
| Exposure to sick or dead poultry | 63/107 (59%) | 439/907 (48.4%) |
| Exposure to backyard poultry | NA | 188/907 (20.7%) |
| Onset of illness to hospitalization (median, days) | 4 | 4 |
| Onset of illness to ARDS (median, days) | 7 | 7.543 |
| Onset of illness to death (median, days) | 21 | 1143 |
| Case fatality rate in hospital | 34% | 53% |
ARDS, acute respiratory distress syndrome; NA, not applicable.