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Table 1 Comparison of immunogenicity of 2010-2011 influenza vaccines against H1N1 pdm09 between infection-primed group and vaccine-primed group among the total subjects

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 = 80) VP (n = 228) P value
Split/subunit ratio   51/29 109/119 0.013
Mean age   8.06 (±4.28) 10.02 (±3.88) 0.001
Seroprotection (%) Baseline 58.75 (47/80) 54.82 (125/228) 0.544
1 month 80.0 (64/80) 75.00 (171/228) 0.367
6 months 70.77 (46/65) 61.86 (120/194) 0.032
Seroconversion (%)   57.5 (46/80) 35.96 (82/228) 0.001
GMT (95 % CI) Baseline 33.93 (29.80–38.05) 27.43 (24.69–30.18) 0.109
1 month 129.96 (99.18–160.74) 66.46 (58.15–72.76) 0.002
6 months 54.50 (42.32–66.67) 37.11 (33.30–40.92) 0.150