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Anti-P. falciparum extract IgG subclass levels versus age in sera from 248 subjects at period P2. Ab levels are expressed as arbitrary units; curves predicted by polynomial regression analysis are shown. (A to D) Anti-P. falciparum extract IgG2 (A), anti-P. falciparum extract IgG3 (B), IgG2/IgG4 (C), and IgG3/IgG4 (D) ratios by age. AU, arbitrary units.
