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Table 1 Seroprevalence of antibodies against H1N1, H1N2 and H3N2 in Farm 1 obtained by HI test

From: Swine influenza virus infection dynamics in two pig farms; results of a longitudinal assessment

Percentage of seropositive animals*
Age (weeks) H1N1 H1N2 H3N2
  Seroprevalence (%) 95% CI Seroprevalence (%) 95% CI Seroprevalence (%) 95% CI
17 83.7 74.5-90.1 0 0-4.7 80.6 71.1-87.6
20 51.6 41.2-61.9 0 0-4.8 96.8 90.5-99.1
24 53.2 42.7-63.5 0 0-4.9 77.7 67.7-85.3
  1. * Cut-off = ≥ 1:20
  2. CI, exact binomial confidence interval