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Memorias del Instituto de Investigaciones en Ciencias de la Salud (Mem. Inst. Investig. Cienc. Salud) is the official publication of the Institute of Research in Health Sciences (IICS) of the National University of Asunción (UNA), Paraguay. It publishes original scientific contributions in clinical medicine, biomedical research, microbiology, molecular biology, dentistry, nursing, nutrition, public health, health biotechnology, genetics, biochemistry, and related disciplines. Founded in 1983, the journal adopted its current name in 2002 and has been published exclusively online since 2015, incorporating XML article dissemination as of 2024. Since 2023, it operates under a continuous publication model. The journal accepts manuscripts in Spanish and English as original research articles, reviews, case studies, and brief communications. All content is available in open access, free of charge for authors and readers, under the Creative Commons Attribution 4.0 International License, in accordance with the Budapest Open Access Initiative (BOAI). It is indexed in BVS, SciELO Paraguay, HINARI, LILACS, DOAJ, Latindex, MIAR, Dialnet, CiteFactor, Google Scholar, LivRe, BASE, EBSCO, and Web of Science – SciELO Citation Index. The journal is funded by IICS-UNA, supports the OAI-PMH protocol for metadata harvesting, and uses the LOCKSS system for digital preservation of its contents.

 
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Agreement between an in-house indirect immunofluorescence assay and a commercial indirect hemagglutination test for detection of anti-Trypanosoma cruzi antibodies

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DOI:

https://doi.org/10.18004/mem.iics/1812-9528/2023.e21122311

Keywords:

Chagas disease, Trypanosoma cruzi, serological diagnosis, serological tests

Abstract

The serological diagnosis of Chagas disease, caused by Trypanosoma cruzi, lacks a "gold standard", being indirect immunofluorescence (IFI) considered the reference test for the detection of antibodies. Currently in Paraguay, the diagnosis is based on combining two serological tests. The objective of the study was to evaluate the agreement between an IFI in-house assay and a commercial indirect haemagglutination test (HAI) for the detection of IgG anti-T. cruzi. A total of 54 samples were evaluated, all from patients who attended the Instituto de Investigaciones en Ciencias de la Salud (IICS) with a medical request for Chagas serology. The specimens were first analyzed by IFI (29 positive and 25 negative) and stored in a serum bank, later they were thawed for analysis by HAI. Agreement between IFI and HAI was determined using the Kappa index. The agreement observed between both methods was very good (Kappa Index=0.96; p<0.0001). No significant differences were observed in the frequencies of samples that presented anti-T. cruzi IgG at low (p=0.759), intermediate (p=1,000) and high (p=0.592) levels. The antibodies measured by both methods showed a good correlation (Spearman's Rho= 0.715; p<0.01). The sensitivity and specificity of HAI versus IFI was 96.6% and 100%, respectively. The findings suggest that the combination of both tests, or HAI with other serological tests, would be a good diagnostic choice in Chagas disease at local level.

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References

Acosta N, López E. Cepas de Trypanosoma cruzi en el Paraguay. Mem Inst Investig Cienc Salud. 2013; 11(2):78-89. Disponible en: http://scielo.iics.una.py/scielo.php?script=sci_arttext&pid=S1812-95282013000200009

Vera E, San Miguel MC, Chaparro F, Franco G. Conocimientos sobre Enfermedad de Chagas y Triatoma infestans en Pobladores del Departamento de San Pedro, Paraguay 2019. An Fac Ciencias Médicas. 2020; 53(1): 81-92. Doi: https://doi.org/10.18004/anales/2020.053.01.81-092

Sánchez Casaccia P, González-Britez N, Acosta N, López E. Vectores de Trypanosoma cruzi en ambientes domésticos y silvestres de las comunidades Ayoreo Totobiegosode del Alto Paraguay. Rev. Soc. cient. Parag. 2019; 24(1): 218-29. Doi: https://doi.org/10.32480/rscp.2019-24-1.218-229

Canese A, Canese A. Manual de Microbiologia y Parasitologia. 7ma edicion General Díaz 970 Asunción, Paraguay. 2012; 275-99.

Sanchez Z, Guillén L, Pineda D, Paredes B, Russomando G. Técnicas moleculares integradas a la vigilancia entomológica de vectores de la enfermedad de Chagas: Estudio del vector secundario Triatoma sordida en la Región Oriental del Paraguay. Mem Inst Investig Cien Salud. 2020; 18(1):76-83. Doi: https://doi.org/10.18004/mem.iics/1812-9528/2020.018.01.76-083

Del-Rei RP, Leony LM, Celedon PAF, Zanchin NIT, Reis MGd, Gomes YdM, et al. Detection of anti-Trypanosoma cruzi antibodies by chimeric antigens in chronic Chagas diseaseindividuals from endemic South American countries. PLoS ONE. 2019; 14(4): 1-12. Doi: https://doi.org/10.1371/journal.pone.0215623

Murillo-Godínez G. Enfermedad de Chagas (tripanosomiasis americana). Med Int Méx. 2018; 34(6): 959-70. Doi: https://doi.org/10.24245/mim.v34i6.2217

Daltro RT, Leony LM, Freitas NEM, Silva ÂAO, Santos EF, Del-Rei RP, et al. Cross-reactivity using chimeric Trypanosoma cruzi antigens: diagnostic performance in settings where Chagas disease and American cutaneous or visceral leishmaniasis are coendemic. J Clin Microbiol. 2019; 57(8): e00762-19. Doi: https://doi.org/10.1128/JCM.00762-19

Berrizbeitia M, Seijas N, Rodríguez J, Jorquera A, Romero L. Estandarización, validación y aplicación de la inmunofluorescencia indirecta en un estudio epidemiológico de la infección por Trypanosoma cruzi. Rev. Soc. Ven. Microbiol. Caracas. 2015; 35(1): 53-59. Disponible en: http://ve.scielo.org/scielo.php?script=sci_arttext&pid=S1315-25562015000100010

OPS, OMS. Guía para el diagnóstico y el tratamiento de la enfermedad de Chagas. Washington, D.C. OPS. 2018. Disponible en: https://iris.paho.org/bitstream/handle/10665.2/49653/9789275320433_spa.pdf

Farfán-García AE, Castellanos-Domínguez YZ, Luna-Marín KP, Angulo-Silva VM. Concordancia de dos pruebas serológicas para el diagnóstico de la enfermedad de Chagas. Rev Salud Pública. 2013; 15(2): 192-202. Disponible en: http://www.scielo.org.co/pdf/rsap/v15n2/v15n2a03.pdf

González L, Scollo K, Bardach A, Sáez-Alquezar A, Ferlín C, Albajar-Viñas P, et al. Inmunoserología y métodos moleculares para el diagnóstico de Chagas: revisión sistemática rápida. Acta bioquím. clín. latinoam. 2017; 51(1): 63-74. Disponible en: https://www.redalyc.org/pdf/535/53550497010.pdf

OPS, OMS. Organización Panamericana de la Salud [Internet]. Enfermedad de Chagas. [citado 12 Sep 2021]. Disponible en: Disponible en: https://www.paho.org/es/temas/enfermedad-chagas

Villagrán-Herrera ME, Sánchez-Moreno M, Rodríguez-Méndez AJ, Hernández-Montiel HL, Dávila-Esquivel F de J, González-Pérez G, et al. Comparative serology techniques for the diagnosis of Trypanosoma cruzi infection in a rural population from the state of Querétaro, Mexico. Mem Inst Oswaldo Cruz. 2014; 109(7): 964-9. Doi: https://doi.org/10.1590/0074-0276130413

Organización Mundial de la Salud. La enfermedad de Chagas (Tripanosomiasis americana): Nota descriptiva N°340; 2016. Disponible en: http://www.who.int/mediacentre/factsheets/fs340/es/

Mamani JI, Bilbao L, Collino JG. Comparación de dos métodos para la determinación de anticuerpos anti Trypanosoma cruzi incorporando un sistema documental. Revista Bioquímica y Patología Clínica. Bioquímica y Patol Clínica (ByPC). Rev la Asoc Bioquímica Argentina (ABA). 2021; 85(3): 44-50. Disponible en: https://www.revistabypc.org.ar/index.php/bypc/article/view/188

Vásquez L, Ruelas N, Córdova E. Patrones de coloración en la inmunofluorescencia indirecta y su utilidad en el diagnóstico de leishmaniasis tegumentaria y enfermedad de Chagas. Acta Med Per. 2011; 28(1): 19-22. Disponible en: http://www.scielo.org.pe/scielo.php?script=sci_arttext&pid=S1728-59172011000100004

Córdova M, Zurita J, Guzmán M, Verduguez A, Rojas E. Patrones diferenciales entre Leishmaniasis y chagas, empleando epimastigotes de Trypanosoma cruzi. Gac Médica Boliv. 2020; 43(2): 120-6. Disponible en: https://doi.org/10.47993/gmb.v43i1.11

Ferrer E, Lares M, Viettri M, Medina M. Comparación entre técnicas inmunológicas y moleculares para el diagnóstico de la enfermedad de Chagas. Enferm Infecc Microbiol Clin. 2013 May 1; 31(5): 277-82. Doi: https://doi.org/10.1016/j.eimc.2012.09.007

Romero-Ruiz S, Miranda-Ulloa E, Briceño-Espinoza R. Rendimiento diagnóstico de la prueba de inmunofluorescencia indirecta para la detección de anticuerpos contra HTLV-1. Rev Peru Med Exp Salud Publica 2017; 34(3):459-65. Doi: https://doi.org/10.17843/rpmesp.2017.343.2635

Araújo A, Aires M. Conventional serological performance in diagnosis of Chagas’ disease in southern. Braz J Infect Dis. 2013; 17(2);174-8. Doi: https://doi.org/10.1016/j.bjid.2012.10.013

SENEPA. Programa Nacional de control de la enfermedad de Chagas. [Internet]. Paraguay. [citado 2 Feb 2022]. Disponible en: Disponible en: http://senepa.gov.py/programa-nacional-de-control-de-la-enfermedad-de-chagas/

Suescún-Carrero SH, Salamanca-Cardozo LP, Pinazo MJ, Armadans-Gil L. Sensitivity and Specificity of two rapid tests for the diagnosis of infection by Trypanosoma cruzi in a Colombian population. PLoS Negl Trop Dis. 2021 2; 15(6): e0009483. Doi: 10.1371/journal.pntd.0009483

SENEPA. Educación comunitaria Por Un Paraguay Sin Chagas. [Internet]. Paraguay. [citado 29 de enero 2022]. Disponible en: Disponible en: http://senepa.gov.py/2021/06/08/educacion-comunitaria-porunparaguaysinchagas/

SENEPA. Paraguay refuerza la lucha contra la Enfermedad de Chagas con las primeras guías de manejo de la patología. [Internet]. Paraguay. [citado 20 ene 2022]. Disponible en: Disponible en: http://senepa.gov.py/2021/07/09/paraguay-refuerza-la-lucha-contra-la-enfermedad-de-chagas-con-las-primeras-guias-de-manejo-de-la-patologia

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Published

2023-08-31

Issue

Section

Original Articles

How to Cite

Chamorro, L., Giménez, V., Sanabria, D., Godoy, A. M., Liuzzi, C., Carpinelli, M. M., & Benegas, S. (2023). Agreement between an in-house indirect immunofluorescence assay and a commercial indirect hemagglutination test for detection of anti-Trypanosoma cruzi antibodies. Memorias Del Instituto De Investigaciones En Ciencias De La Salud, 21(1). https://doi.org/10.18004/mem.iics/1812-9528/2023.e21122311