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Am. J. Trop. Med. Hyg., 17(4), 1968, pp. 528-539
Copyright © 1968 by The American Society of Tropical Medicine and Hygiene

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A Comparative Study of the Antigens of Some of the "Histolytica-Type" Strains of Entamoeba

A Qualitative and Quantitative Evaluation of Antigens by Indirect Hemagglutination, Gel-Precipitation, and Immunoelectrophoresis*

Z. Ali Khan AND E. Meerovitch
Institute of Parasitology, McGill University, Macdonald College P.O., P.O., Canada

Antigens prepared from trophozoites of Entamoeba histolytica (DKB strain), the room-temperature strains Laredo and Huff, E. moshkovskii (FIC strain), and E. invadens (PZ and SivL strains) were made to react against human anti-E. histolytica serum and rabbit anti-DKB and anti-PZ serum in indirect-hemagglutination and immunodiffusion tests. Control experiments (which all gave negative results) consisted in testing positive antiserum against the antigen prepared from penicillin-inhibited Bacteroides symbiosus (the culture associate of amebae) and against the components of the culture medium.

Immunoelectrophoretic analysis of the antigens indirectly confirmed the results of the immunodiffusion tests and demonstrated that the bands that showed reactions of partial identity had curvatures different from those of their counterparts, while having identical or similar electrophoretic mobilities.

In general it was found that all the strains of Entamoeba studied have common antigenic moieties. More precise results should be obtained when the antigens are fractionated and the fractions are tested independently.


* With financial assistance from the National Research Council of Canada and with the aid of Public Health Grant No. 604-7-557 awarded through the Quebec Ministry of Health.






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Copyright © 1968 by the American Society of Tropical Medicine and Hygiene.