It has been suggested in several recent articles1 that the incidence of amebic (Endamoeba histolytica) infestation among the people of the United States may be higher than is generally believed. While no statistics are available dealing specifically with the degree of amebic (E. histolytica) infestation of "healthy" normal adults in different parts of this country, other data may be used, by comparison, to support this belief. For instance, recent statistics, such as those presented in the studies referred to, show for individuals examined an average incidence of about 12 to 15 per cent infestation with E. histolytica. It must be noted that this rather high figure is obtained from studies chiefly in the so-called protozoal endemic areas (California, the Mexican border and the Gulf states) and moreover on sick people seeking treatment either from private physicians or from hospitals and clinics. It is assumed that a high incidence of