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Presence of circulating HPV-16 and HPV-18 specific IgG and memory B cells. Proportion of subjects with both IgG and memory B cells, only IgG, only memory B cells or undetectable responses are shown for each vaccine and age group; for HPV-16 10–12 y, n = 40 (Cervarix) and n = 31 (Gardasil); for HPV-16 16–20 y, n = 32 (Cervarix) and n = 20 (Gardasil); for HPV-18 10–12 y, n = 38 (Cervarix) and n = 31 (Gardasil); for HPV-18 16–20 y, n = 31 (Cervarix) and n = 20 (Gardasil).
