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Table 2 Proportion of participants with influenza-like illness and laboratory-confirmed influenza, and influenza attack rates

From: Epidemiology and burden of influenza in healthy children aged 6 to 35 months: analysis of data from the placebo arm of a phase III efficacy trial

  South Africa Philippines European countries a Overall
Measure N = 239 N = 1469 N = 502 N = 2210
Influenza-like illness, n (%) b 45 (18.8) 510 (34.7) 256 (51.0) 811 (36.7)
Laboratory-confirmed influenza, n (%) c 16 (35.6) 136 (26.7) 103 (40.2) 255 (31.4)
Influenza attack rate, % (95% CI) b 6.7 (3.5; 9.9) 9.3 (7.8; 10.7) 20.5 (17.0; 24.1) 11.5 (10.2; 12.9)
  1. Abbreviations: CI, confidence interval
  2. aFrance, Greece, Italy, Spain, and Romania
  3. bPercentage of all participants
  4. cPercentage of participants with influenza-like illness