Evaluation of the impact of polyclonal infection and heteroresistance on treatment of tuberculosis patients.

Abstract:

:Mixed strain infections of Mycobacterium tuberculosis make diagnosis, treatment, and control of tuberculosis (TB) more difficult. This study was aimed to evaluate the relationship between mixed infections, antibiotic resistance patterns and treatment of TB patients. In this study, among 2850 suspected TB clinical samples, a total of ninety-six clinical samples from 66 TB confirmed patients were subjected to the 24-locus variable-number tandem repeat method to evaluate the prevalence of mixed infections. For all studied strains, 288 colonies (three individual clones for each sample) were isolated from different colonies and separately analyzed by the Drug Susceptibility Test (DST). For all patients, follow up was done after 6 months of treatment. Based on direct 24 loci MIRU-VNTR, in the 66 TB patients, 53% (35/66) showed mixed infection. In the mixed samples, 45.71% (16/35) showed different antibiotic resistant patterns. Among the mixed infection patients, eight (22.9%; 8/35) showed treatment failure after six- month therapy. Six of these non-treated patients (75%; 6/8) had different antibiotic resistant patterns. We conclude that mixed infections, have a negative impact on treatment of TB patients especially when co-infecting M. tuberculosis strains display heteroresistance.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kargarpour Kamakoli M,Sadegh HR,Farmanfarmaei G,Masoumi M,Fateh A,Javadi G,Rahimi Jamnani F,Vaziri F,Siadat SD

doi

10.1038/srep41410

subject

Has Abstract

pub_date

2017-01-25 00:00:00

pages

41410

issn

2045-2322

pii

srep41410

journal_volume

7

pub_type

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