Immunohistochemical reaction for trophozoites in the liver of mice inoculated with E. histolytica or E. dispar treated and untreated with dexamethasone. Hepatic necrosis (N) induced in mice of the EGG group (a) and the MCR group (c). Trophozoites of E. histolytica and E. dispar immunostained within the hepatic necrosis (arrowheads). Absence of trophozoites in the hepatic necrosis (N) in the groups EGG-DEX (b) and MCR-DEX (d). Non-necrotic hepatic parenchyma (H). Bar 50 μm. Harris's haematoxylin counterstained.