“…Extensive studies have been conducted with human strains of E. histo lylka in laboratory animals in an attempt (a) to correlate nutrition of the host with amebic infection (29 to 32); (b) to serve for screening of new drugs (33,34,35); and (c) to elucidate the conditions under which the parasite, after colonization in the intestinal wall, reaches and becomes estab lished in the liver (36 to 39). Results have been contradictory with respect to different carbohydrate, protein, and vitamin requirements for E. histo lytica.…”