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Cardoso CAA, Rossoni AMDO, Rezende JMD, Aurilio RB, Santos RJFLD, Ferrarini MAG, Kritski AL, Martin A, Sant'Anna CC. String test: a potentially useful tool in the diagnosis of pulmonary tuberculosis in Brazilian children and adolescents. Rev Inst Med Trop Sao Paulo 2022; 64:e27. [PMID: 35384958 PMCID: PMC8993147 DOI: 10.1590/s1678-9946202264027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 03/07/2022] [Indexed: 11/25/2022] Open
Abstract
This study investigated the potential use of the String Test (ST) for the
diagnosis of pulmonary tuberculosis (PTB) in children and adolescents. This is a
case series of patients aged 4-15 years presenting with clinically presumed PTB
and submitted to ST in three pediatric TB referral centers in Brazil, between
November 2017 and July 2020. The ST was performed in the morning, after 4-12 h
of fasting, followed by ingestion of the capsule by the patient, which was
attached to the patient’s malar region. The material was collected for
simultaneous smear microscopy (acid-fast bacilli - AFB),
culture and the molecular investigation by the GeneXpert MTB/RIF®.
Thirty-three patients with presumed PTB were included and ST was performed in 26
(78.8%) of them and 7 (21.2%) patients could not swallow the cord. The diagnosis
of PTB was established in 11 (42.3%) of the 26 patients who underwent the ST.
The diagnosis of PTB was confirmed (by culture or GeneXpert MTB/RIF®)
in 5 patients, 4 of whom were also positive by the ST. Two of them showed
positivity by the GeneXpert MTB/RIF® only in the ST sample. Two other
patients had a positive ST following the induced sputum test (AFB, GeneXpert
MTB/RIF®, and positive culture in both specimens). Thus, ST was
positive in 36.4% of the patients in whom PTB was diagnosed. ST could be a
useful test for diagnosing PTB in children and adolescents.
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Affiliation(s)
| | | | - Joana Moraes de Rezende
- Universidade Federal do Rio de Janeiro, Instituto de Puericultura e Pediatria Martagão Gesteira, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rafaela Baroni Aurilio
- Universidade Federal do Rio de Janeiro, Instituto de Puericultura e Pediatria Martagão Gesteira, Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | - Afranio Lineu Kritski
- Universidade Federal do Rio de Janeiro, Faculdade de Medicina, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Anandi Martin
- Ghent University, Department of Biochemistry and Microbiology, Laboratory of Microbiology, Ghent, Belgium
| | - Clemax Couto Sant'Anna
- Universidade Federal do Rio de Janeiro, Instituto de Puericultura e Pediatria Martagão Gesteira, Rio de Janeiro, Rio de Janeiro, Brazil.,Universidade Federal do Rio de Janeiro, Faculdade de Medicina, Rio de Janeiro, Rio de Janeiro, Brazil
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