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Comparative VSG-specific Ab responses of infected IFNAR1 KO mice. Ab titers measured in the plasma of infected Ifnar1−/− (▲) and wt C57BL/6 mice (■). Mice were infected i.p. with 105 parasites, blood was collected by tail bleed at the time points shown, and plasma Ab titers for IgM, IgG1, IgG2a, and IgG3 were measured by sandwich ELISA.
