Table 2.
Absolute and relative number of patients tested positive for pH1N1 by case definition and study period, hospital-based surveillance of acute respiratory infections, Berlin, 2009/10
| No. tested for influenza (%) | No. testing positive for influenza* (%) | ||
|---|---|---|---|
| CD1 | Period 1 | 60/110 (55%) | 16 (29%) |
| Period 2 | 294/915 (32%) | 4 (1%) | |
| Total | 354/1,025 (35%) | 20 (6%) | |
| CD1b | Period 1 | 32/71 (45%) | 7 (25%) |
| Period 2 | 174/671 (26%) | 2 (1%) | |
| Total | 206/742 (28%) | 9 (5%) | |
| CD4 | Period 1 | 28/39 (72%) | 9 (32%) |
| Period 2 | 120/244 (49%) | 2 (2%) | |
| Total | 148/283 (52%) | 11 (8%) | |
*Patients with missing PCR results excluded