Abstract

ASTUDILLO, Osvaldo Germán; ROSELLA, Tatiana; ANSALDO, Mariana  and  BAVA, Amadeo Javier. Evaluación del desempeño de una prueba rápida para el tamizaje de la infección por Trypanosoma cruzi en pacientes con el virus de la inmunodeficiencia humana. Acta bioquím. clín. latinoam. [online]. 2021, vol.55, n.4, pp.475-483. ISSN 0325-2957.

A quick and safe diagnosis of Trypanosoma cruzi infection allows the immediate etiological treatment in clinically manifested cases. In the present work, the performance of the rapid Chagas Ab Rapid SD Bioline (PDR) test for serological diagnosis was evaluated in 100 sera from patients with a presumptive diagnosis of T. cruzi infection, it was compared with the diagnostic standard (serological pair) and this technique was valued to be used within the laboratory routine. The PDR revealed a very good concordance index with respect to the diagnostic standard (Kappa=0.989 [95% CI 0.965-1.000]) and the parameters of sensitivity, specificity, positive and negative predictive values revealed good performance. The Youden index reported good performance of the diagnostic test (J = 0.98 [95% CI 0.93-1.02]); and in the same sense, both the positive likelihood ratio (RV (+) = infinity), and the negative (RV (-) = 0.02 [95% CI 0.00-0.16]) showed an increased probability whether the target disease was present or absent, when the technique so determined. The use of a PDR, due to its simplicity and good performance (with results available on the same day) would produce an optimization of resources, could be carried out in places where access to the diagnosis is limited and where its incorporation would not require an important infrastructure. On the other hand, in our case, it could be used as a second test, to increase the specificity of the serological diagnosis of T. cruzi infection.

Keywords : Immunocromatography; Rapid test; Trypanosoma cruzi.

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