Alternative definition : KEGG: Entamoeba histolytica, an extracellular protozoan parasite, is a human pathogen
that invades the intestinal epithelium. Infection occurs upon ingestion of contaminated
water and food. The pathogenesis of amoebiasis begins with parasite attachment and
disruption of the intestinal mucus layer, followed by apoptosis of host epithelial
cells. Intestinal tissue destruction causes severe dysentery and ulcerations in amoebic
colitis. Several amoebic proteins such as lectins, cysteine proteinases, and amoebapores
are associated with the invasion process. The parasite can cause extraintestinal infection,
like amoebic liver abscess, by evading the immune response.;