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Table 3 Results of 2009 pandemic influenza A (H1N1) antibodies before and after the pandemic in 60 vaccinated and 90 unvaccinated health care workers at a children's hospital in Taiwan

From: Longitudinal seroepidemiologic study of the 2009 pandemic influenza A (H1N1) infection among health care workers in a children's hospital

  All (N = 150) Vaccinated (N = 60)
No. (%)
Unvaccinated (N = 90)
    All
No. (%)
High-risk (N = 40)3
No. (%)
Low-risk (N = 50)3
No. (%)
P value1
Seroprotective       
Baseline2 7 (4.7%) 2 (3.3%) 5 (5.6%) 3 (7.5%) 2 (4.0%) 0.652
Second2 13 (8.7%) 2 (3.3%) 11 (12.2%) 8 (20.0%) 3 (6.0%) 0.056
Third2 52 (35.4%) 34 (56.7%) 18 (20.0%) 12 (30.0%) 6(12.0%) 0.061
Seroconversion       
1st to 2nd sera 6 (4.0%) 0 (0.0%) 6 (6.7%) 5 (12.5%) 1 (2.0%) 0.085
2nd to 3 rd sera 39 (26.5%) 32 (53%) 7 (7.8%) 4 (10.0%) 3 (6.0%) 0.695
1st to 3 rd sera 45 (30.6%) 32 (53%) 13 (14.4%) 9 (22.5%) 4 (8.0%) 0.071
GMT (95% CI)       
Base line 11.0 (10.7-12.0%) 11.0 (10.5-12.6) 11.2 (10.4-12.1) 12.1 (10.5-13.9) 10.6 (9.7-11.5) 0.049
Second 12.4 (11.4-13.6%) 11.4 (10.4-12.4) 13.2 (11.5-15.1) 16.0 (12.6-20.3) 11.3 (9.9-12.9) 0.013
Third 19.2 (16.6-22.1%) 31.4 (23.8-36.8) 14.0 (12.0-16.3) 18.3 (14.0-24.1) 11.3 (9.8-13.1) 0.003
  1. Abbreviations: GMT: geometric mean titer; CI: confidence interval.
  2. 1 Comparisons were made between high- and normal-risk groups, using Chi-square or Fisher exact tests.
  3. 2 See text and Figure 2 for definitions of baseline, second, and third samples.
  4. 3 See text for definitions of high- and low-risk.