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Bacterial numbers in the spleen from C57BL/6 and BALB/c mice 5 days after infection with 2 × 104 or 2 × 103 Y. enterocolitica, respectively, and i.p. administration of PBS or 1 μg of TGF-β2 on days −1, 0, +1, +2, and +3 p.i. The results are the means and standard deviations for four mice. The asterisk indicates a statistically significant difference (P < 0.01) compared with the values obtained with the control group.
