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Cytokine production of PPD-stimulated spleen cells from IL-6 KO, TNFR1 KO, TNFR1 and IL-6 DKO, and WT BALB/C mice. Single cell suspensions obtained from each group 4 weeks after infection in IL-6 KO mice (n = 4), TNFR1 KO mice (n = 2), and WT DBA/1 control mice (n = 10) were pooled and cultured with 20 μg/mL of PPD for 48 h, and then cytokine concentrations were measured. Results are means ± S.E.M. of triplicate cultures in each group. *P < .01 by Student's t-test.
