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300 adolescents aged 12–15 years were randomised (1:1) into two groups to compare the long-term (10 years) immunogenicity profile of two doses of an Adult formulation [Group HAB_2D: 150; 0–6 months] vs. three doses of a Paediatric formulation [Group HAB_3D: 150; 0–1–6 months] of a combined hepatitis A and B (HAB) vaccine. At Year 10, anti-HAV seropositivity rate was 100% in both groups, while 85.9%...