Estandarización de una reacción en cadena de la polimerasa en tiempo real (qPCR) para la detección de Strongyloides stercoralis en muestras de materia fecal
Abstract:Introducción: el diagnóstico de estrongiloidiasis se realiza de rutina en los laboratorios clínicos; sin embargo, su detección se dificulta debido a la baja excreción parasitaria y la baja sensibilidad de las pruebas parasitológicas empleadas. Objetivo: diseñar y estandarizar una PCR en tiempo real (qPCR) para la detección de ADN de Strongyloides stercoralis en muestras de materia fecal. Materiales y métodos: se establecieron las condiciones de qPCR y se evaluaron: a) la especificidad analítica mediante anális… Show more
“…The threshold cycle (Ct) value obtained with the standardized qPCR was less than or equal to 29.99 in the positive samples. A Ct value between 30.00 and 34.99 was considered indeterminate, assuming that only samples with a very low parasitic load would show those values 27 .…”
Section: Molecular Analysis and Qpcr Based On 18s Rrna Gene Sequencesmentioning
The diagnostic sensitivity of qPCR to detect strongyloidiasis is analogous to that of conventional parasitology methods, with an additional advantage of being capable of identifying the parasite DNA at low sample concentrations.
“…The threshold cycle (Ct) value obtained with the standardized qPCR was less than or equal to 29.99 in the positive samples. A Ct value between 30.00 and 34.99 was considered indeterminate, assuming that only samples with a very low parasitic load would show those values 27 .…”
Section: Molecular Analysis and Qpcr Based On 18s Rrna Gene Sequencesmentioning
The diagnostic sensitivity of qPCR to detect strongyloidiasis is analogous to that of conventional parasitology methods, with an additional advantage of being capable of identifying the parasite DNA at low sample concentrations.
“…Each dilution was carried out with two replicates, two negative controls, and two no-template controls. These dilutions were also compared with end-point PCR to determine the level of LOD between both techniques [ 36 ]. The number of copies of the serial dilutions was calculated with an equation described by Shirima et al [ 37 ].…”
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