The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease · 1999
Drug-resistant strains of Mycobacterium tuberculosis isolated in Russia.
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Stepanshina V N, Panfertsev E A, Korobova O V, Shemyakin I G, Stepanshin Y G, Medvedeva I M, Dorozhkova I R
Аннотация
SETTING: State Research Center for Applied Microbiology, Russian Research Institute of Phthisiopulmonology (Ministry of Health, Moscow).
OBJECTIVE: To analyze drug-resistant clinical isolates of Mycobacterium tuberculosis obtained from patients referred to the institute from different parts of Russia, and to study the mechanisms of their rifampicin resistance.
DESIGN: Fifty clinical isolates of M. tuberculosis were analysed. Polymerase chain reaction (PCR) and sequencing were used to study the mechanisms of rifampicin resistance in 25 isolates.
RESULTS: Among cultures isolated from 50 patients, drug resistance was detected in 33. Most of the isolates were resistant to rifampicin (25 isolates), isoniazid (14 isolates), and streptomycin (seven isolates). Only 6% of the isolates were resistant to one drug, while 14% were resistant to two, 32% to three, 40% to four, and 8% to five drugs. Susceptible isolates were derived from 17 patients. The following point mutations and deletions in the rpoB locus, responsible for high level rifampicin resistance (more than 50 microg/ml in egg-based medium), were detected: G-->A/395 (Arg-->Gln), C-->T/232 (His-->Tyr), C-->T/221 (Ser-->Leu), G-->T/202 (Asp-->Tyr), GA-->TT/202-203 (Asp-->Phe), deltaATGGACCAG/199-207 (Met, Asp, Gin), A-->T/91 (Met-->Leu), TG-->CC/227-228 (Leu-->Ser), GAG-->AGT/349-350-351 (Gln-->Ser), deltaGGG/354(Gly).
CONCLUSION: A number of previously unrecognised genetic modifications in the rpoB region were found in rifampicin-resistant strains isolated from patients from different parts of Russia.
OBJECTIVE: To analyze drug-resistant clinical isolates of Mycobacterium tuberculosis obtained from patients referred to the institute from different parts of Russia, and to study the mechanisms of their rifampicin resistance.
DESIGN: Fifty clinical isolates of M. tuberculosis were analysed. Polymerase chain reaction (PCR) and sequencing were used to study the mechanisms of rifampicin resistance in 25 isolates.
RESULTS: Among cultures isolated from 50 patients, drug resistance was detected in 33. Most of the isolates were resistant to rifampicin (25 isolates), isoniazid (14 isolates), and streptomycin (seven isolates). Only 6% of the isolates were resistant to one drug, while 14% were resistant to two, 32% to three, 40% to four, and 8% to five drugs. Susceptible isolates were derived from 17 patients. The following point mutations and deletions in the rpoB locus, responsible for high level rifampicin resistance (more than 50 microg/ml in egg-based medium), were detected: G-->A/395 (Arg-->Gln), C-->T/232 (His-->Tyr), C-->T/221 (Ser-->Leu), G-->T/202 (Asp-->Tyr), GA-->TT/202-203 (Asp-->Phe), deltaATGGACCAG/199-207 (Met, Asp, Gin), A-->T/91 (Met-->Leu), TG-->CC/227-228 (Leu-->Ser), GAG-->AGT/349-350-351 (Gln-->Ser), deltaGGG/354(Gly).
CONCLUSION: A number of previously unrecognised genetic modifications in the rpoB region were found in rifampicin-resistant strains isolated from patients from different parts of Russia.