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Parasite-specific antibodies determination in the sera from day 10 infected C57BL/6 IL-12 knockout and wild-type C57BL/6 mice. Day 0 refers to uninfected mice. IgG1, IgG2a and IgG2b antibody levels are expressed by the mean OD accompanied by the SD, obtained in the sera from three mice at the reciprocal of the tested serum dilutions. *P < 0·05.
