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Table 2 Subjects with anti-PT IgG levels above/below the various cut-offs

From: Seroprevalence of Bordetella pertussis antibodies in adults in Hungary: results of an epidemiological cross-sectional study

Anti-PT IgG level Total (n = 1999) Age groups
18–29 years (n = 408) 30–44 years (n = 541) 45–59 years (n = 509) ≥60 years (n = 541)
Strongly indicative of current/recent infection (≥1.5 OD units) 2 (0.10 [0.01–0.36]) 0 (0.00 [0.00–0.90]) 1 (0.18 [0.00–1.03]) 1 (0.20 [0.00–1.09]) 0 (0.00 [0.00–0.68])
Indicative of current/recent infection (≥1.0 OD units) 22 (1.10 [0.69–1.66]) 2 (0.49 [0.06–1.76]) 5 (0.92 [0.30–2.14]) 4 (0.79 [0.21–2.00]) 11 (2.03 [1.02–3.61])
Seropositive (>0.3 OD units) 295 (14.76 [13.23–16.39]) 67 (16.42 [12.96–20.38]) 67 (12.38 [9.73–15.46]) 56 (11.00 [8.42–14.05]) 105 (19.41 [16.16–23.00])
Seronegative (≤0.3 OD units) 1704 (85.24 [83.61–86.77]) 341 (83.58 [79.62–87.04]) 474 (87.62 [84.54–90.27]) 453 (89.00 [85.95–91.58]) 436 (80.59 [77.00–83.84])
  1. Data are n (% [95% CI])
  2. Abbreviations: Anti-PT IgG anti-pertussis toxin immunoglobulin G, CI confidence interval, OD optical density