Prevalence and Molecular Characteristics of Drug-Resistant Mycobacterium tuberculosis in Hunan, China

• DOI: 10.1128/aac.02426-14
• Publication Date: 2014-04-15T03:30:53Z
• Authors: Li-li Zhao; Yan Chen; Zhong-nan Chen; Hai-can Liu; Pei-lei Hu; Qing Sun; Xiu-qin Zhao; Yi Jiang; Gui-lian Li; Yun-hong Tan; Kang-lin Wan
• Keywords: Adult; Aged, 80 and over; DNA, Bacterial; Male; 0301 basic medicine; China; Adolescent; Genotype; Antitubercular Agents; Microbial Sensitivity Tests; Mycobacterium tuberculosis; Sequence Analysis, DNA; Middle Aged; 3. Good health; Young Adult; 03 medical and health sciences; Drug Resistance, Bacterial; Mutation; Tuberculosis, Multidrug-Resistant; Humans; Female; Aged; Demography

ABSTRACT

To determine the prevalence and molecular characteristics of drug-resistant tuberculosis in Hunan province, drug susceptibility testing and spoligotyping methods were performed among 171 M. tuberculosis isolates. In addition, the mutated characteristics of 12 loci, including katG , inhA , rpoB , rpsL , nucleotides 388 to 1084 of the rrs gene [ rrs (388–1084)], embB , pncA , tlyA , eis , nucleotides 1158 to 1674 of the rrs gene [ rrs (1158–1674)], gyrA , and gyrB , among drug-resistant isolates were also analyzed by DNA sequencing. Our results indicated that the prevalences of isoniazid (INH), rifampin (RIF), streptomycin (SM), ethambutol (EMB), pyrazinamide (PZA), capreomycin (CAP), kanamycin (KAN), amikacin (AKM), and ofloxacin (OFX) resistance in Hunan province were 35.7%, 26.9%, 20.5%, 9.9% 15.2%, 2.3%, 1.8%, 1.2%, and 10.5%, respectively. The previously treated patients presented significantly increased risks for developing drug resistance. The majority of M. tuberculosis isolates belonged to the Beijing family. Almost all the drug resistance results demonstrated no association with genotype. The most frequent mutations of drug-resistant isolates were katG codon 315 ( katG 315 ), inhA15 , rpoB 531 , rpoB 526 , rpoB 516 , rpsL 43 , rrs 514 , embB 306 , pncA 96 , rrs 1401 , gyrA 94 , and gyrA 90 . These results contribute to the knowledge of the prevalence of drug resistance in Hunan province and also expand the molecular characteristics of drug resistance in China.