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Volume 52, Issue 3

Characterization of rifampicin-resistant in Taiwan Free

Abstract

Sixty-three rifampicin-resistant (Rif) isolates from Kaohsiung, Taiwan, were analysed for mutations in the core region (69 bp, codons 511–533) of the gene. Some 84.1 % (53/63) of the resistant isolates showed mutations in this region, especially in codons 531 (41.5 %), 526 (18.9 %), 516 (15.1 %) and 533 (7.5 %). Five novel alleles of a total of 16 different types of mutations were identified in Rif isolates. Ten Rif isolates (15.9 %) exhibited no mutations in the core region of . Also, they did not show mutations in another 365 bp fragment (codons 99–220) of . The agar proportion method was used to determine the relationship between the degree of rifampicin resistance and alterations in the core region of . The results revealed that the mean MIC was 92.38 μg ml for the 53 isolates with a mutation in the core region, whereas the mean MIC of the other 10 isolates without mutations was only 24.8 μg ml. This indicates that the isolates with mutations in the core region had higher levels of resistance than those without mutations in this region. IS restriction fragment length polymorphism (RFLP) was used for typing of 55 Rif isolates. Isolates contained two to 19 copies of IS, with sizes ranging from 600 to 16 000 bp. The majority (85 %) contained six to 16 copies. No strains lacking IS were found. A total of 54 of 55 RFLP types were defined at the 90 % similarity level. The observation of varied IS-associated banding patterns indicates that an outbreak of drug-resistant tuberculosis did not occur in this area.

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© 2003 Society for General Microbiology
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2003-03-01
2024-05-05
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Characterization of rifampicin-resistant Mycobacterium tuberculosis in Taiwan
J. Med. Microbiol. 52, 239 (2003); https://doi.org/10.1099/jmm.0.05045-0
/content/journal/jmm/10.1099/jmm.0.05045-0
/content/journal/jmm/10.1099/jmm.0.05045-0
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