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Hepatitis B seroprofiles according to age in 1- to 19-year-olds, Belgium, 2006–2007 (N = 2379). ‘Ever infected’ = seronegative for anti-HBs and seropositive for anti-HBc and/or HBsAg or seropositive for anti-HBs as well as anti-HBc; ‘Undetermined’ = incomplete, equivocal or conflicting results (i.e. positive for anti-HBs as well as HBsAg); ‘Vaccinated’ = solely anti-HBs > 11 IU/ml. ‘All negative’ = anti-HBs <9 IU/ml and seronegative for antiHBc as well as HBsAg.
