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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

From: Lessons from a one-year hospital-based surveillance of acute respiratory infections in Berlin- comparing case definitions to monitor influenza

   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%)
  1. *Patients with missing PCR results excluded