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Table 2 Comparison of immunogenicity of 2010-2011 influenza vaccines against H1N1 pdm09 between infection-primed group and vaccine-primed group in children 9-18 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 = 32) VP (n = 145) P value
Split/subunit ratio   17/15 57/88 0.152
Mean age   12.57 (±2.52) 12.22 (±2.22) 0.432
Seroprotection (%) Baseline 71.88 (23/32) 57.24 (83/145) 0.098
1 month 93.75 (30/32) 73.79 (107/145) 0.001
6 months 78.26 (18/23) 57.03 (73/128) 0.038
Seroconversion (%)   68.75 (22/32) 37.24 (54/145) 0.001
GMT (95 % CI) Baseline 45.55 (36.80–54.29) 29.18 (25.51–32.84) 0.041
1 month 246.75 (177.61–315.89) 69.98 (59.69–80.26) 0.000
6 months 101.81 (65.66–137.96) 39.57 (34.91–44.22) 0.001