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HIGH PREVALENCE RATE OF ENTAMOEBA HISTOLYTICA ASYMPTOMATIC INFECTION IN A RURAL MEXICAN COMMUNITY

FERNANDO RAMOSDepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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PATRICIA MORÁNDepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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ENRIQUE GONZÁLEZDepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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GABRIELA GARCÍADepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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MANUEL RAMIRODepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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ALEJANDRO GÓMEZDepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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MARÍA DEL CARMEN GARCÍA DE LEÓNDepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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EMMA I. MELENDRODepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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ALICIA VALADEZDepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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CECILIA XIMÉNEZDepartamento de Medicina Experimental (Department of Experimental Medicine), Facultad de Medicina (School of Medicine), UNAM (National Autonomous University of Mexico), Mexico Distrito Federal, Mexico; Hospital Regional 1° de Octubre (October 1st Regional Hospital), ISSSTE, Mexico Distrito Federal, Mexico; Coordinación de Investigación en Salud (Health Research Coordination), Centro Médico Siglo XXI (21st Century Nacional Medical Center), IMSS (Mexican Institute of Social Security), Mexico Distrito Federal, Mexico

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The frequency of Entamoeba histolytica and Entamoeba dispar infection was analyzed in a rural community in the state of Morelos, Mexico, using polymerase chain reaction (PCR). Sociodemographic variables as risk factors for the infection were assessed. Results highlighted the number of individuals with intestinal parasites (43.1%) in the community, indicating extensive fecalism. A high frequency of E. histolytica asymptomatic infection, higher than E. dispar infection (13.8% versus 9.6%), was detected by PCR. Anti-amebic antibody levels (IgG) in serum and saliva (IgA) samples were not associated with E. histolytica intestinal infection. These findings suggest a predominant distribution of E. histolytica strains of low invasive potential in this community.

Author Notes

Reprint requests: Dra. Cecilia Ximénez, Departamento de Medicina Experimental, Facultad de Medicina, UNAM, Dr. Balmis 148, Col. Doctores, CP 06726, México D.F., México. Telephone: +5255-5623 2666, Fax: +5255-5623 2669, E-mail: cximenez@servidor.unam.mx.
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