The percentage of splenic B cells expressing IL-10 was increased at twelve weeks post-infection (F(3, 17) = 15.84, P < 0.001), while TGF-β in splenic CD19+ B cells was elevated at eight weeks after infection but declined thereafter (F(3, 17) = 4.979, P < 0.01) (Fig. 2c). Here, CD19 is linked to infection.