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A method described for large scale cultivation ofEntamoeba histolytica axenically in a modified Diamond’s TP-S-1 monophasic medium. Crude amoebaantigen prepared by the ultrasonication of the trophozoites ofE. histolytica, was fractionated by sephadex G-200 column into four different fractions. The whole antigen and its different fractions were freeze-dried and upon reconstitution contained approximately 1.8 mg N/ml or roughly the equivalent of 10 × 106 amoebae per ml. Both whole antigen and its fractions have been used for the detection of specific antibody in the patients’ sera. Rabbits were immunised with the antigen and the immunoglobulins were separated from hyperimmune sera by DEAE-cellulose chromatography and salt fractionations. Sera collected from different categories of amoebiasis patients, amoebic liver abscess, amoebic hepatitis, amoebic dysentery, and asymptomatic amoebiasis, were tested serologically using standard amoeba-antigen for serodiagnosis and epidemiological assay of amoebiasis. Results of the assay showed that standard amoeba-antigen is very useful for diagnosis of invasive amoebiasis.

Preparation of standard amoeba-antigen from axenicEntamoeba histolytica and its use in the serodiagnosis and seroepidemiology of amoebiasis