A significant increase in the number of IL-10 producing T cells was observed in infected mice at 3 and 9 days post infection, whereas macrophages presented increased production of IL-10 only at 3 d.p.i. Moreover, the number of IL-10 producing B cells, neutrophils, and dendritic cells did not change significantly when compared to uninfected mice (Fig. 3A and 3B, and data not shown). The gene discussed is IL10; the disease is infection.