Increasing incidence of quinolone resistance in human non-typhoid Salmonella enterica isolates in Korea and mechanisms involved in quinolone resistance
| Autor: | Myungsik Choi, Su-Jin Park, Mi Na Kim, Nam Yong Lee, Eun Ju Choo, Jung-Eun Lee, Jin-Yong Jeong, Bok Kwon Lee, Yang Soo Kim, Jun Hee Woo, Jiso Ryu, Nam Joong Kim, Sang-Ho Choi, Yee Gyung Kwak |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Microbiology (medical)
Salmonella Nalidixic acid Salmonella enteritidis Microbial Sensitivity Tests Drug resistance Biology medicine.disease_cause Microbiology Nalidixic Acid Bacterial Proteins Ciprofloxacin Drug Resistance Bacterial medicine Humans Pharmacology (medical) Organic Chemicals Serotyping Bacteriophage Typing Phage typing Antibacterial agent Pharmacology Molecular Epidemiology Korea Salmonella enterica biology.organism_classification DNA Fingerprinting Virology Anti-Bacterial Agents Random Amplified Polymorphic DNA Technique Infectious Diseases Genes Bacterial Mutation Salmonella Infections Solvents DNA Topoisomerases medicine.drug |
| Zdroj: | Journal of Antimicrobial Chemotherapy. 56:1111-1114 |
| ISSN: | 1460-2091 0305-7453 |
| Popis: | Objectives We investigated the trends of nalidixic acid resistance in human non-typhoid Salmonella enterica in a Korean population, and examined some possible mechanisms involved in this resistance. Methods A total of 261 clinical strains were tested. For all strains, the MICs of nalidixic acid were determined. Nalidixic acid-resistant strains underwent further analysis, including determination of MICs of other antibiotics, mutation analysis within the topoisomerase genes, organic solvent tolerance test, western blotting for AcrA, marOR mutation analysis, ciprofloxacin accumulation test, and PCR for the qnr gene. The clonal relationships of Salmonella strains were examined by random amplified polymorphic DNA analysis. Results The incidence of nalidixic acid resistance increased from 1.8% in 1995-96 to 21.8% in 2000-02. The resistance rate was higher in S. enterica serotype Enteritidis (21.6%) than in serotype Typhimurium (12.1%). The nalidixic acid resistance rates in Salmonella Enteritidis varied according to the phage type (PT) and Salmonella Enteritidis PT 1 was most commonly associated with resistance to nalidixic acid. Several cases of clonal spread, especially by Salmonella Enteritidis PT 1, were identified. Of the 46 nalidixic acid-resistant strains, 43 had single mutations in the gyrA gene. Four strains were organic solvent-tolerant and were associated with decreased ciprofloxacin accumulation; three of these showed increased expression of AcrA and had novel mutations in marOR (84L). The qnr gene was not identified. Conclusions Recently, the rate of nalidixic acid resistance in Korean clinical Salmonella strains markedly increased and it was partly due to the clonal spread of Salmonella Enteritidis, especially PT 1. The main mechanism of nalidixic acid resistance was a mutation in the gyrA region. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|