Figure 5: The infiltration of lymphocytes in the tumor from the mice (×100, H.E staining). The infiltration of lymphocytes was observed in the tumor section from mice treated with recombinant attenuated S. typhimurium strains. It showed that the number of lymphocytes was obviously more in the tumor from TPI group (a) than in the tumor from TP (b) and TPG group (c).