Interestingly, in the colostrum from mothers with recent G. lamblia infection, there was an increase in CD4+CD25+FOXP3+ cells and an increase in TGF-β levels, suggesting that G. lamblia infection favors a regulatory environment and that it can probably be a determinant for symptomatic infections since these mothers had recent diarrhea. The gene discussed is TGFB1; the disease is infection.