Evaluación de dos métodos inmunocromatográficos comerciales para el diagnóstico rápido de Giardia duodenalis y Cryptosporidium spp. en muestras de heces / Assessment of two commercially available immunochromatographic assays for a rapid diagnosis of Giardia duodenalis and Cryptosporidium spp. in human fecal specimens

Introducción En este trabajo se evalúan y comparan dos métodos inmunocromatográficos para la detección simultánea de Giardia duodenalis y Cryptosporidium spp. en muestras de heces. Métodos Se han analizado 254 muestras de heces con dos métodos inmunocromatográficos, Crypto-Giardia (CerTest Biotec) y Stick Crypto-Giardia (Operon). Resultados En el diagnóstico de G. duodenalis, la sensibilidad y especificidad fueron del 97 y el 100%, respectivamente, para CerTest; y del 97 y el 95% para Operon. En el diagnóstico de Cryptosporidium spp., la sensibilidad obtenida con el método de CerTest fue del 100%, frente a la sensibilidad del 92% obtenida con Operon. No hubo falsos positivos con ninguna de las dos técnicas. Conclusiones Ambos métodos presentan buenas sensibilidad y especificidad, por lo que son de utilidad para el diagnóstico rápido de G. duodenalis y Cryptosporidium spp. Las ventajas de los métodos inmunocromatográficos son su rapidez y que no necesitan de personas expertas en microscopia ni de equipos especiales (AU)

Introduction: To assess and compare the performance of two immunochromatographic tests for the simultaneous detection of Giardia duodenalis and Cryptosporidium spp. in faeces.Materials and methods: In this study 254 faeces samples were tested using the two immunochromatographystrips Cryto-Giardia (CerTest Biotec) and Stick Crypto-Giardia (Operon). Results: In the diagnosis of G. duodenalis, the sensitivity and specificity of the kits were 97% and 100%, respectively for the CerTest; and 97% and 95% for Operon. In the diagnosis of Cryptosporidium spp. Certeststrip rendering a sensitivity of 100%, compared to with a sensitivity of 92% using Operon. There were nofalse positives using either technique.Conclusions: Both methods yielded good sensitivity and specificity values and are thus useful tools fora rapid diagnosis of G. duodenalis and Cryptosporidium spp. The benefits of immunochromatography methods are that there is no requirement for expert microscopists or special equipment (AU)

[Assessment of two commercially available immunochromatographic assays for a rapid diagnosis of Giardia duodenalis and Cryptosporidium spp. in human fecal specimens]. / Evaluación de dos métodos inmunocromatográficos comerciales para el diagnóstico rápido de Giardia duodenalis y Cryptosporidium spp. en muestras de heces.

INTRODUCTION: To assess and compare the performance of two immunochromatographic tests for the simultaneous detection of Giardia duodenalis and Cryptosporidium spp. in faeces. MATERIALS AND METHODS: In this study 254 faeces samples were tested using the two immunochromatography strips Cryto-Giardia (CerTest Biotec) and Stick Crypto-Giardia (Operon). RESULTS: In the diagnosis of G. duodenalis, the sensitivity and specificity of the kits were 97% and 100%, respectively for the CerTest; and 97% and 95% for Operon. In the diagnosis of Cryptosporidium spp. Certest strip rendering a sensitivity of 100%, compared to with a sensitivity of 92% using Operon. There were no false positives using either technique. CONCLUSIONS: Both methods yielded good sensitivity and specificity values and are thus useful tools for a rapid diagnosis of G. duodenalis and Cryptosporidium spp. The benefits of immunochromatography methods are that there is no requirement for expert microscopists or special equipment.

Diagnóstico de las parasitosis intestinales mediante detección de coproantígenos / Diagnostic of intestinal parasitosis by coproantigen detection

Las parasitosis intestinales presentan una alta prevalencia en áreas tropicales y países en desarrollo, pero también son frecuentes en países industrializados. Tradicionalmente, su diagnóstico se ha realizado por el examen microscópico de las heces del paciente. Estas determinaciones muestran una sensibilidad pobre, exigen la toma de muestras seriadas, son muy laboriosas y requieren especialización técnica. En los últimos años, el avance en el estudio molecular de estos parásitos y la investigación de la respuesta inmune específica del paciente, junto con el empleo de las nuevas metodologías diagnósticas, han posibilitado el desarrollo de sistemas de detección más eficaces que apoyan al clínico, permiten el seguimiento de los tratamientos y facilitan los estudios epidemiológicos. Entre ellos, cabe destacar los métodos de detección de coproantígenos, que, en general, presentan buena especificidad y sensibilidad, y además se desarrollan en formatos sencillos, unas propiedades que los convierten en una herramienta útil en los laboratorios de microbiología

Intestinal parasites are highly prevalent in tropical areas and developing countries, but are also common in industrialised countries as well. Traditionally, their diagnosis has been made by microscopic examinations of the faeces of the patient. These have been shown to have poor sensitivity, require serial samples, are very time-consuming and require a specialised technique. In the last few years, advances in the molecular biology of these parasites and research into the specific immune response of the patient, has made it possible to develop more efficient detection systems that help the clinician, allow treatments to be followed up and make it easier to carry out epidemiological studies. Among these systems are the methods for detecting faecal antigens, which, in general, have good specificity and sensitivity; properties which make them a useful tool in microbiology laboratorios

[Autochthonous amebic liver abscess in Spain: an emerging disease? Case report and description of a PCR-based diagnostic test]. / Absceso hepático amebiano autóctono en España: una enfermedad emergente? Descripción de 2 nuevos casos clínicos y de una técnica diagnóstica basada en la reacción en cadena de la polimerasa.

INTRODUCTION: In Spain an increase in cases of amebiasis has been detected in patients with no history of traveling to, or immigration from, endemic areas. MATERIAL AND METHODS: This study describes two new cases of amebic hepatic abscess due to native protozoa and reviews 21 more cases of amebic hepatic abscess reported in Spanish patients who had never left the Iberian Peninsula. In addition, a new PCR-based technique for diagnosing Entamoeba histolytica is described. RESULTS: Twenty cases (87%) occurred in men. The age range of the affected patients was 26 to 77 years. Two of the 3 women with extraintestinal amebiasis were HIV-positive. There was no history of exposure to the parasite in 17 cases. In the remaining 6 cases, direct contact with patients affected with amebiasis or with individuals or foods from endemic areas was recorded. CONCLUSION: Entamoeba histolytica infection is becoming an emerging disease in our country. Amebiasis should be included in the differential diagnosis of consistent clinical entities even when there is no background of traveling or immigration. New molecular diagnostic tools can help to characterize this infection and should be considered reference techniques in combination with serological methods.

Disentería amebiana autóctona. Descripción de 3 casos / No disponible

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