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WT B6 mice were infected with LCMV-Armstrong or -Clone13. The serum levels of anti-LCMV IgM (A), total IgG (B), IgG1 (C), and IgG2c (D) at days 8, 29, and 60 pi were measured by ELISA. The data represent 6 mice from 2 experiments. *P < 0.05; **P < 0.01.
