OCCURRENCE OF FLUOROQUINOLONE RESISTANCE GENES AMONG E. coli ISOLATES COLLECTED FROM AKAGAWA WATER SYSTEM IN YAMAGATA, JAPAN
Angeline Odilia, Dr. Ir. Muhammad Nur Cahyanto, M.Sc.; Prof. Toru Watanabe
2023 | Skripsi | TEKNOLOGI PANGAN & HASIL PERTANIAN
The extensive usage of antibiotics might alter the susceptibility of bacteria to antimicrobial agents in the environment. This study aims to detect the occurrence of quinolone resistance-determining regions (QRDRs) and plasmid-mediated quinolone resistance (PMQR) genes among E. coli isolates collected from Akagawa Water System in Yamagata Prefecture and to understand their resistance patterns.
River water was sampled once a month from April 2021 to March 2022. The occurrence of fluoroquinolone resistance genes was examined by qualitative PCR assay and the susceptibility of Escherichia coli (E. coli) to antimicrobial agents was determined by antibiotic susceptibility test.
The results revealed that among the 653 isolates included in this study, 5.82% isolate were confirmed to harbored at least one of six PMQR genes, with qnrS was the most prevalent genes and qnrC was not found in all isolates. The QRDRs of gyrA was detected in most isolates (94.49%) while parC was not detected in all isolates. Fluoroquinolone-resistant E. coli were also found. In this study, 13 strains showed resistance to ciprofloxacin (CPFX) and 12 strains showed resistance to levofloxacin (LVFX). Sequencing is needed to determine the mutations in QRDRs and further analysis is required to investigate the other mechanisms of fluoroquinolone resistance.
Kata Kunci : Fluoroquinolones, Escherichia coli, plasmid-mediated quinolone resistance, quinolone resistance-determining regions