摘要： 27 guinea pigs were divided into 6 groups, 5 animals in each of the groups 1-5and 2 animals in group 6. The 1st group was inoculated intracaecally with a strain ofEntamoeba histolytica trophozoites which were cultured in the presence of cholesteroland the 2nd with the same strain cultured in a medium without cholesterol. The 3rd