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Table 3 Comparison of immunogenicity of 2010-2011 influenza vaccines against H1N1 pdm09 between infection-primed group and vaccine-primed group in subjects less than 8 years of age

From: The priming effect of previous natural pandemic H1N1 infection on the immunogenicity to subsequent 2010-2011 influenza vaccination in children: a prospective cohort study

  IP (n = 46) VP (n = 66) P value
Split/subunit ratio   32/14 44/22 0.749
Mean age   4.90 (±1.76) 5.17 (±1.77) 0.414
Seroprotection (%) Baseline 47.83 (22/46) 50.0 (33/66) 0.823
1 month 69.57 (32/46) 78.79 (52/66) 0.283
6 months 65.85 (27/41) 56.00 (28/50) 0.344
Seroconversion (%)   47.83 (22/46) 40.91 (27/66) 0.472
GMT (95 % CI) Baseline 27.03 (22.77–31.29) 24.67 (20.36–28.99) 0.620
1 month 80.00 (62.62–97.38) 61.53 (50.70–72.35) 0.392
6 months 37.38 (30.03–44.74) 31.17 (24.22–38.11) 0.481