AUTHOR=Batista Angelica Martins , Pavan Tycha Bianca Sabaini , de Almeida Eros Antonio , de Alcantara Daniel Maximo Corrêa , Andrade Paula Durante , Martins Luiz Cláudio , Wanderley Jamiro da Silva , Costa Sandra Cecília Botelho , Marcon Gláucia Elisete Barbosa 

TITLE=Molecular diagnosis of Chagas disease in patients with megaesophagus exhibiting negative or inconclusive serological results

JOURNAL=Frontiers in Parasitology

VOLUME=Volume 4 - 2025

YEAR=2025

URL=https://www.frontiersin.org/journals/parasitology/articles/10.3389/fpara.2025.1622149

DOI=10.3389/fpara.2025.1622149

ISSN=2813-2424

ABSTRACT=Chagasic megaesophagus is a relatively uncommon clinical manifestation in individuals with chronic Chagas disease (CD), and it has not been extensively documented in literature. However, individuals may exhibit negative or inconclusive serology for CD. This study aimed to assess the performance of molecular diagnostics for CD in participants with these conditions. This was a prospective cohort study that included 26 participants with negative or inconclusive conventional CD serology (Group I), 33 participants with positive CD serology and megaesophagus (Group II), and 10 participants with negative serology and no CD epidemiological history (Group III). Blood samples were collected for serological tests (ELISA and IFAT), blood cultures, and molecular tests like nested PCR (nPCR) targeting Sat-DNA and kDNA, as well as quantitative PCR (qPCR) of T. cruzi. Statistical analyses applying the Composite Reference Standard (CRS), showed that diagnosis by Sat-DNA nPCR had a sensitivity of 95% (95% CI: 82%–99%), a specificity of 81% (95% CI: 64%–93%), an accuracy of 88%. When considering a positive result from at least one molecular test, 20 out of 26 participants with megaesophagus and negative or inconclusive conventional serology were identified (76.9%). This study reinforce the greater detection capacity of Sat-DNA nPCR compared to the diagnostic methods tested. This emphasizes the importance of employing molecular diagnosis to clarify the etiology in megaesophagus cases.