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Prevalence, Risk Factors, and Treatment Outcomes of Isoniazid- and Rifampicin- Mono-Resistant Pulmonary Tuberculosis in Lima, Peru

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  • Leonela Villegas
  • Larissa Otero
  • Timothy R Sterling
  • Moises A Huaman
  • Patrick Van der Stuyft
  • Eduardo Gotuzzo
  • Carlos Seas

Abstract

Background: Isoniazid and rifampicin are the two most efficacious first-line agents for tuberculosis (TB) treatment. We assessed the prevalence of isoniazid and rifampicin mono-resistance, associated risk factors, and the association of mono-resistance on treatment outcomes. Methods: A prospective, observational cohort study enrolled adults with a first episode of smear-positive pulmonary TB from 34 health facilities in a northern district of Lima, Peru, from March 2010 through December 2011. Participants were interviewed and a sputum sample was cultured on Löwenstein-Jensen (LJ) media. Drug susceptibility testing was performed using the proportion method. Medication regimens were documented for each patient. Our primary outcomes were treatment outcome at the end of treatment. The secondary outcome included recurrent episodes among cured patients within two years after completion of the treatment. Results: Of 1292 patients enrolled, 1039 (80%) were culture-positive. From this subpopulation, isoniazid mono-resistance was present in 85 (8%) patients and rifampicin mono-resistance was present in 24 (2%) patients. In the multivariate logistic regression model, isoniazid mono-resistance was associated with illicit drug use (adjusted odds ratio (aOR) = 2.10; 95% confidence interval (CI): 1.1–4.1), and rifampicin mono-resistance was associated with HIV infection (aOR = 9.43; 95%CI: 1.9–47.8). Isoniazid mono-resistant patients had a higher risk of poor treatment outcomes including treatment failure (2/85, 2%, p-value

Suggested Citation

  • Leonela Villegas & Larissa Otero & Timothy R Sterling & Moises A Huaman & Patrick Van der Stuyft & Eduardo Gotuzzo & Carlos Seas, 2016. "Prevalence, Risk Factors, and Treatment Outcomes of Isoniazid- and Rifampicin- Mono-Resistant Pulmonary Tuberculosis in Lima, Peru," PLOS ONE, Public Library of Science, vol. 11(4), pages 1-11, April.
    • Handle: RePEc:plo:pone00:0152933
    DOI: 10.1371/journal.pone.0152933
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    1. Matthew Arentz & Bess Sorensen & David J Horne & Judd L Walson, 2013. "Systematic Review of the Performance of Rapid Rifampicin Resistance Testing for Drug-Resistant Tuberculosis," PLOS ONE, Public Library of Science, vol. 8(10), pages 1-1, October.
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    1. Ninfa Marlen Chaves Torres & Jecxy Julieth Quijano Rodríguez & Pablo Sebastián Porras Andrade & María Belen Arriaga & Eduardo Martins Netto, 2019. "Factors predictive of the success of tuberculosis treatment: A systematic review with meta-analysis," PLOS ONE, Public Library of Science, vol. 14(12), pages 1-24, December.

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