ARG1 and Hepatic fibrosis: To address this issue, we used CD86+CD11b+F4/80+ defining as an activation marker of M1 macrophage whereas CD206+CD11b+F4/80+ were used to assess M2 activation, we found that TLR4 deficiency in C57BL/10 increase M2 macrophage producing the molecules of Arg-1, Ym1 and Fizz1 to possibly result in severe immunopathological damages (such as liver fibrosis), however, whether the biased type 2 immune responses induced by TLR4 deficiency may affect the development of the worms in the host or not, it remains to be further studied.