Although TGF-β has been shown to be produced by B cells and macrophages in BALB/c mice [29], consistent with this report, we did not observe any increase in circulating TGF-β1, TGF-β2, or TGF-β3 at 21 or 42 days post infection of C57BL/6 mice (data not shown). This evidence concerns the gene TGFB1 and infection.