An analysis was made of the isoenzyme patterns of 61 Entamoeba histolytica strains: 42 from Cuba and 19 from Angola Mozambique and Ghana. By means of these patterns the non-pathogenic nature of the Cuban strains (Group 1) was shown. It coincided with the clinical characteristics of the infection in the carriers. Among the imported strains were 2 samples with pathogenic patterns II corresponding to 1 dysentery case and to 1 asymptomatic patient, and also non-pathogenic ones (I, II, III and XVIII).
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