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. 2012 Mar 1;8(3):312–322. doi: 10.4161/hv.18569

Table 3. Average vaccine efficacies against influenza like illness per age groups.

Age group
 Vaccine efficacy against ILI
 Sources
  Average Minimum Average Average Maximum  
0–18 y old
 27.5%
 39%
 48.5%
 33–35
19–64 y old
 16.5%
 30%
 34.5%
 28, 36
65+ y old 22.5% 41% 52.0% 36–39