Figure 2From: Persistence of antibodies in laboratory staff immunized with quadrivalent meningococcal polysaccharide vaccineKinetics of serum IgG concentrations against capsular polysaccharides of meningococcal serogroups A, C, W135, and Y . Obs: observed concentration; Trend: fitted line of linear models (slopes were not significantly different from zero for any of the serogroups); GMC: geometric mean concentration.Back to article page