Differentiation of entamoeba histolytica/entamoeba dispar by PCR and their correlation with humoral and cellular immunity in individuals with clinical variants of amoebiasis.

Sánchez-Guillén, María Del Carmen; Pérez-Fuentes, Ricardo; Salgado-Rosas, Hilda; Ruı́z-Argüelles, Alejandro; Ackers, J. P.; Shire, Abdirashid M.; Talamás‐Rohana, Patricia

doi:10.4269/ajtmh.2002.66.731

Cited by 43 publications

(31 citation statements)

References 67 publications

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“…Mora et al 31 estudiaron mediante nested-multiplex PCR, 428 pacientes con síntomas gastrointestinales, encontrando una prevalencia de E. histolytica de 6,31%, 4,44% de E. dispar y 4 casos de infección mixta. Aunque otros autores han referido la presencia de sangre en las muestras con E. histolytica 32,33 ; 553 pb 567 pb en la presente investigación, sólo un paciente infectado con E. histolytica (1/31), presentó sangre en la muestra fecal al momento del examen macroscópico, por lo que no se pudo efectuar correlación entre estas variables. Es posible justificar la ausencia de sangre en las heces de los pacientes incluidos en este estudio, si para el momento en que los individuos entregaron su muestra, el parásito todavía no hubiere invadido la mucosa intestinal.…”

Section: Análisis Estadísticounclassified

Detección y diferenciación de Entamoeba histolytica y Entamoeba dispar mediante reacción en cadena de la polimerasa en individuos de una comunidad del Estado Zulia, Venezuela

et al. 2009

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La identificación diferencial de Entamoeba histolytica y Entamoeba dispar es esencial para un tratamiento adecuado del paciente y con fines epidemiológicos. Para determinar la prevalencia de E. histolytica y E. dispar se estandarizó y aplicó un ensayo de PCR, utilizando oligonucleótidos específicos para cada especie. 204 muestras de heces de individuos de la comunidad de Santa Rosa de Agua (Municipio Maracaibo, Estado Zulia, Venezuela), fueron analizadas a través del examen directo con SSF (0,85%) y lugol, concentrado de formol-éter y PCR. Al examen microscópico, 42 individuos (20,58%) presentaron formas evolutivas del complejo E. histolytica/E. dispar; mientras que la técnica de PCR evidenció un total de 47 casos positivos a estas amibas; de los cuales 22 eran portadores de E. histolytica (10,78%), 16 (7,84%) de E. dispar y 9 (4,41%) presentaron infección mixta. No hubo diferencia significativa al relacionar las variables sexo y presencia de E. histolytica y/o E. dispar, ni con los grupos etarios. No existieron casos de estas amibas, en los menores de 2 años. La frecuencia observada de E. histolytica (31/204), demuestra el carácter endémico de la amibiasis en esta comunidad.

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Section: Análisis Estadísticounclassified

Detección y diferenciación de Entamoeba histolytica y Entamoeba dispar mediante reacción en cadena de la polimerasa en individuos de una comunidad del Estado Zulia, Venezuela

et al. 2009

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“…moshkovskii complex within a stool specimen, while other techniques such as PCR or ELISA must be employed for differentiation. A number of PCR assays are available for detection and/or differentiation of Entamoeba species (62,127,239). A unique approach to diagnosis of E. histolytica infection is described by Britten et al (37), which makes use of DNA probes conjugated to an antibody-detectable protein tag.…”

Section: Entamoeba Histolyticamentioning

confidence: 99%

Clinical Significance of Enteric Protozoa in the Immunosuppressed Human Population

et al. 2009

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SUMMARY Globally, the number of immunosuppressed people increases each year, with the human immunodeficiency virus (HIV) pandemic continuing to spread unabated in many parts of the world. Immunosuppression may also occur in malnourished persons, patients undergoing chemotherapy for malignancy, and those receiving immunosuppressive therapy. Components of the immune system can be functionally or genetically abnormal as a result of acquired (e.g., caused by HIV infection, lymphoma, or high-dose steroids or other immunosuppressive medications) or congenital illnesses, with more than 120 congenital immunodeficiencies described to date that either affect humoral immunity or compromise T-cell function. All individuals affected by immunosuppression are at risk of infection by opportunistic parasites (such as the microsporidia) as well as those more commonly associated with gastrointestinal disease (such as Giardia). The outcome of infection by enteric protozoan parasites is dependent on absolute CD4+ cell counts, with lower counts being associated with more severe disease, more atypical disease, and a greater risk of disseminated disease. This review summarizes our current state of knowledge on the significance of enteric parasitic protozoa as a cause of disease in immunosuppressed persons and also provides guidance on recent advances in diagnosis and therapy for the control of these important parasites.

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“…While staining of fixed fecal smears can determine the presence of the E. histolytica-E. dispar-E. moshkovskii complex within a stool specimen, other techniques, such as PCR or enzyme-linked immunosorbent assay (ELISA), must be employed for differentiation of the species. A number of PCR assays are available for detection and/or differentiation of Entamoeba species and have become the methods of choice due to excellent sensitivity and specificity (3,11,19).…”

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confidence: 99%

Evaluation of Multiplex Tandem Real-Time PCR for Detection of Cryptosporidium spp., Dientamoeba fragilis , Entamoeba histolytica , and Giardia intestinalis in Clinical Stool Samples

et al. 2011

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The aim of this study was to describe the first development and evaluation of a multiplex tandem PCR (MT-PCR) assay for the detection and identification of 4 common pathogenic protozoan parasites, Cryptosporidium spp., Dientamoeba fragilis, Entamoeba histolytica, and Giardia intestinalis, from human clinical samples. A total of 472 fecal samples submitted to the Department of Microbiology at St. Vincent's Hospital were included in the study. The MT-PCR assay was compared to four real-time PCR (RT-PCR) assays and microscopy by a traditional modified iron hematoxylin stain. The MT-PCR detected 28 G. intestinalis, 26 D. fragilis, 11 E. histolytica, and 9 Cryptosporidium sp. isolates. Detection and identification of the fecal protozoa by MT-PCR demonstrated 100% correlation with the RT-PCR results, and compared to RT-PCR, MT-PCR exhibited 100% sensitivity and specificity, while traditional microscopy of stained fixed fecal smears exhibited sensitivities and specificities of 56% and 100% for Cryptosporidium spp., 38% and 99% for D. fragilis, 47% and 97% for E. histolytica, and 50% and 100% for G. intestinalis. No cross-reactivity was detected in 100 stool samples containing various other bacterial, viral, and protozoan species. The MT-PCR assay was able to provide rapid, sensitive, and specific simultaneous detection and identification of the four most important diarrhea-causing protozoan parasites that infect humans. This study also highlights the lack of sensitivity demonstrated by microscopy, and thus, molecular methods such as MT-PCR must be considered the diagnostic methods of choice for enteric protozoan parasites.Enteric protozoa continue to be the most commonly encountered parasitic diseases and to cause significant morbidity and mortality throughout both developed and developing regions of the world, affecting millions of people each year (22). While Blastocystis hominis is the most common protozoan parasite detected in stool samples, the major etiological agents of parasitic diarrhea are considered to be Cryptosporidium spp., Dientamoeba fragilis, Entamoeba histolytica, and Giardia intestinalis (22).E. histolytica is a pathogenic amoeboid protozoan parasite for which humans are the primary reservoir (27). It is a potentially invasive pathogen and the causative agent of amebiasis, with approximately 50 million cases and 100,000 deaths annually (28). The clinical presentation can range from asymptomatic carriage to gastrointestinal disease and invasive disease. E. histolytica is morphologically identical to the nonpathogenic species Entamoeba dispar and Entamoeba moshkovskii, though genetic differences have confirmed their separation into independent species (4, 20). Due to this conserved morphology, stained smears of stool specimens are insufficient for differentiation of the species. Currently, the only way to differentiate the pathogenic E. histolytica from the nonpathogenic strains via microscopy is to visualize ingested red blood cells within the E. histolytica trophozoite; however, this is rarely seen i...

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Differentiation of entamoeba histolytica/entamoeba dispar by PCR and their correlation with humoral and cellular immunity in individuals with clinical variants of amoebiasis.

Cited by 43 publications

References 67 publications

Detección y diferenciación de Entamoeba histolytica y Entamoeba dispar mediante reacción en cadena de la polimerasa en individuos de una comunidad del Estado Zulia, Venezuela

Detección y diferenciación de Entamoeba histolytica y Entamoeba dispar mediante reacción en cadena de la polimerasa en individuos de una comunidad del Estado Zulia, Venezuela

Clinical Significance of Enteric Protozoa in the Immunosuppressed Human Population

Evaluation of Multiplex Tandem Real-Time PCR for Detection of Cryptosporidium spp., Dientamoeba fragilis , Entamoeba histolytica , and Giardia intestinalis in Clinical Stool Samples

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