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Table 2 Estimated parameters of the decay of serum-bactericidal antibody titers after meningococcal polysaccharide vaccination

From: Persistence of antibodies in laboratory staff immunized with quadrivalent meningococcal polysaccharide vaccine

Serogroup L0(CI) k (CI) λ (CI)
A 834.1 (219; 3,176.5) −0.025 (−0.048; -0.003) 27.4 (14.5; 248.9)
C 2,522.2 (442.2; 14,387.8) −0.032 (−0.061; -0.002) 21.9 (11.3; 343.7)
W135 541.5 (73.0; 4,016.4) −0.037 (−0.070; -0.003) 18.8 (9.8; 224.1)
Y 1,687 (413.3; 6,886.5) −0.025 (−0.048; -0.001) 28.0 (14.3; 641.6)
  1. L 0 : titer after vaccination, CI: 95% confidence interval, k: first-order rate constant, λ: half-life in months (derived from k).