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A monoclonal antibody for distinction of invasive and noninvasive clinical isolates of Entamoeba histolytica.

  • A Gonzalez-Ruiz
  • R Haque
  • T Rehman
  • A Aguirre
  • C Jaramillo
  • G Castañon
  • A Hall
  • F Guhl
  • G Ruiz-Palacios
  • D C Warhurst
Publication Date
Nov 01, 1992
  • Biology
  • Medicine


Approximately 10% of the world population is infected with Entamoeba histolytica, but only 10% of the carriers develop symptomatic amebiasis. This discrepancy could be explained by the genotypic differences between the morphologically indistinguishable invasive and noninvasive strains of E. histolytica currently identified by zymodeme analysis, a technique that is unsuitable for routine diagnostic laboratories. Here we report the production of a monoclonal antibody against E. histolytica and its use in an immunofluorescence assay to identify invasive isolates cultured from stool samples of infected patients in several regions where amebiasis is endemic: Bangladesh, Colombia, and Mexico. After testing a total of 88 E. histolytica isolates, the correlation between zymodeme characterization and the immunofluorescence assay with the invasive isolate-specific monoclonal antibody was 100%. The epitope detected by the invasive isolate-specific monoclonal antibody resides in a previously undescribed internal protein with molecular masses of 84 and 81 kDa in axenic and polyxenic E. histolytica strains, respectively.

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