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J. O. S. Osisanya, D. C. Warhurst, Specific anti-amoebic immunoglobulins and the cellulose acetate precipitin test in Entamoeba histolytica infection, Transactions of The Royal Society of Tropical Medicine and Hygiene, Volume 74, Issue 5, 1980, Pages 605–608, https://doi.org/10.1016/0035-9203(80)90149-2
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Summary
Using the indirect fluorescent antibody test and sera from 10 proved cases of invasive amoebiasis, the effects of absorption of IgG on observed titres of amoeba-specific IgM and IgA were investigated. In addition, results of cellulose acetate precipitin tests were compared with anti-amoebic antibody levels.
Antiamoebic IgM was found at titres of 1:14 to 1:112 after IgG absorption in four cases. Antiamoebic IgA was detected in sera from four cases, but the maximum titre was 1:28. There was no relationship between the presence of amoeba-specific IgM or IgA and the result of the precipitin test, but a raised anti-amoebic IgG level was consistently found where the precipitin test was positive. However, sera with raised amoeba-specific IgG levels did not invariably give a positive precipitin reaction.
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