Comparison of the characteristics of Mycobacterium tuberculosis isolates from sputum and lung lesions in chronic tuberculosis patients

Mycobacterium tuberculosis (Mtb) in sputum originates from lung cavities in tuberculosis (TB) patients. But drug susceptibility testing (DST) of sputum Mtb can not be conducted the same as in the lung because mutagenesis of bacilli may be happening in the lung during treatment and result in the poss...

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Veröffentlicht in:European journal of clinical microbiology & infectious diseases 2017-11, Vol.36 (11), p.2063-2072
Hauptverfasser: Hong, M.-S., Kim, Y., Cho, E.-J., Lee, J.-S., Kwak, H.-K., Kim, J.-H., Kim, C.-T., Cho, J.-S., Park, S.-K., Jeon, D., Choi, Y.-I., Lee, H., Eum, S.-Y.
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container_end_page 2072
container_issue 11
container_start_page 2063
container_title European journal of clinical microbiology & infectious diseases
container_volume 36
creator Hong, M.-S.
Kim, Y.
Cho, E.-J.
Lee, J.-S.
Kwak, H.-K.
Kim, J.-H.
Kim, C.-T.
Cho, J.-S.
Park, S.-K.
Jeon, D.
Choi, Y.-I.
Lee, H.
Eum, S.-Y.
description Mycobacterium tuberculosis (Mtb) in sputum originates from lung cavities in tuberculosis (TB) patients. But drug susceptibility testing (DST) of sputum Mtb can not be conducted the same as in the lung because mutagenesis of bacilli may be happening in the lung during treatment and result in the possibility of the presence of heterogeneous drug-resistant subpopulations in the different lung lesions. This could be one of the reasons for low cure rates for multi-drug resistant (MDR)-TB. We studied the resected lungs of nine surgery patients with chronic TB. The isolates isolated from the sputum and different lung lesions of each patient were tested for phenotypic DST and genotyped using restriction fragment length polymorphism (RFLP) typing method. Genetic analysis to resistance to first and second line drugs was also performed. Five of nine patients were MDR-TB and three XDR-TB. DST results for ten anti-TB drugs were in accordance among different lung lesions in eight patients. However, only three of these eight patients showed the concordance of DST with sputum. Even though the isolates were heteroresistant, genotyping them by RFLP showed the clonal population in each individual patient. Six of eight followed-up patients achieved successful cure. In conclusion, the heteroresistance between sputum and lung lesions and a clonal population without mixed infection might provide useful information in establishing treatment regimen and surgery decision for MDR- and XDR-TB.
doi_str_mv 10.1007/s10096-017-3025-5
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But drug susceptibility testing (DST) of sputum Mtb can not be conducted the same as in the lung because mutagenesis of bacilli may be happening in the lung during treatment and result in the possibility of the presence of heterogeneous drug-resistant subpopulations in the different lung lesions. This could be one of the reasons for low cure rates for multi-drug resistant (MDR)-TB. We studied the resected lungs of nine surgery patients with chronic TB. The isolates isolated from the sputum and different lung lesions of each patient were tested for phenotypic DST and genotyped using restriction fragment length polymorphism (RFLP) typing method. Genetic analysis to resistance to first and second line drugs was also performed. Five of nine patients were MDR-TB and three XDR-TB. DST results for ten anti-TB drugs were in accordance among different lung lesions in eight patients. However, only three of these eight patients showed the concordance of DST with sputum. Even though the isolates were heteroresistant, genotyping them by RFLP showed the clonal population in each individual patient. Six of eight followed-up patients achieved successful cure. 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But drug susceptibility testing (DST) of sputum Mtb can not be conducted the same as in the lung because mutagenesis of bacilli may be happening in the lung during treatment and result in the possibility of the presence of heterogeneous drug-resistant subpopulations in the different lung lesions. This could be one of the reasons for low cure rates for multi-drug resistant (MDR)-TB. We studied the resected lungs of nine surgery patients with chronic TB. The isolates isolated from the sputum and different lung lesions of each patient were tested for phenotypic DST and genotyped using restriction fragment length polymorphism (RFLP) typing method. Genetic analysis to resistance to first and second line drugs was also performed. Five of nine patients were MDR-TB and three XDR-TB. DST results for ten anti-TB drugs were in accordance among different lung lesions in eight patients. However, only three of these eight patients showed the concordance of DST with sputum. 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Even though the isolates were heteroresistant, genotyping them by RFLP showed the clonal population in each individual patient. Six of eight followed-up patients achieved successful cure. In conclusion, the heteroresistance between sputum and lung lesions and a clonal population without mixed infection might provide useful information in establishing treatment regimen and surgery decision for MDR- and XDR-TB.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>28620844</pmid><doi>10.1007/s10096-017-3025-5</doi><tpages>10</tpages></addata></record>
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subjects Adult
Antitubercular Agents - therapeutic use
Bacilli
Biomedical and Life Sciences
Biomedicine
Drug resistance
Drug Resistance, Multiple, Bacterial - genetics
Female
Gene polymorphism
Genetic analysis
Genotyping
Humans
Internal Medicine
Lesions
Lung - microbiology
Lung - pathology
Lungs
Male
Medical Microbiology
Microbial Sensitivity Tests
Middle Aged
Mixed infection
Multidrug resistance
Mutagenesis
Mycobacterium tuberculosis
Mycobacterium tuberculosis - drug effects
Mycobacterium tuberculosis - genetics
Mycobacterium tuberculosis - isolation & purification
Original Article
Patients
Polymorphism
Polymorphism, Restriction Fragment Length
Restriction fragment length polymorphism
Sputum
Sputum - microbiology
Subpopulations
Surgery
Tuberculosis
Tuberculosis, Multidrug-Resistant - drug therapy
Tuberculosis, Multidrug-Resistant - microbiology
Tuberculosis, Pulmonary - drug therapy
Tuberculosis, Pulmonary - microbiology
Young Adult
title Comparison of the characteristics of Mycobacterium tuberculosis isolates from sputum and lung lesions in chronic tuberculosis patients
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