Masatoshi Tanaka1, Ryusaburo Furuya2, Intetsu Kobayashi3, Izumo Kanesaka3, Akira Ohno3, Akiko Kanayama Katsuse3. 1. Department of Urology, Faculty of Medical, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan. Electronic address: matanaka@cis.fukuoka-u.ac.jp. 2. Department of Urology, Faculty of Medical, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan. 3. Department of Infection Control and Prevention, Faculty of Nursing, Toho University, Tokyo, Japan.
Abstract
OBJECTIVES: Antimicrobial resistance and molecular characteristics of Neisseria gonorrhoeae isolates obtained from 1996-2005 (n=200) and 2008-2016 (n=200) in Fukuoka, Japan, were examined. METHODS: MICs were determined by agar dilution. Sequence types (STs) were examined using N. gonorrhoeae multiantigen sequence typing (NG-MAST). Sequencing of major extended-spectrum cephalosporin (ESC) resistance determinants (penA, mtrR and ponA) was performed. RESULTS: Increases in the proportion of gonococci with decreased susceptibility or resistance to cefixime (from 18.0% in 1996-2005 to 46.0% in 2008-2016) and ceftriaxone (from 2.5% to 4.0%) were observed. Gonococcal isolates also showed increased resistance to ciprofloxacin and azithromycin. The four most prevalent NG-MAST STs with a multidrug-resistant phenotype were ST2958 (n=18), ST1407 (n=14), ST6798 (n=12) and ST4015 (n=10). The number of isolates belonging to these four STs rose between the first and second period. Among the 54 isolates belonging to the four major STs, 42 (77.8%) contained a penA mosaic allele and 12 (22.2%) contained a penA non-mosaic allele. The sequence pattern types in the 42 isolates with a penA mosaic allele included type X (64.3%), type XXXIV (33.3%) and a novel pattern type (2.4%). In contrast, all 12 isolates with the penA non-mosaic allele included the sequence pattern type V. CONCLUSION: Neisseria gonorrhoeae isolates with decreased susceptibility or resistance to ESC have increased over the years. Four major STs with a multidrug-resistant phenotype were identified. These isolates contained a penA mosaic allele or a non-mosaic allele.
OBJECTIVES: Antimicrobial resistance and molecular characteristics of Neisseria gonorrhoeae isolates obtained from 1996-2005 (n=200) and 2008-2016 (n=200) in Fukuoka, Japan, were examined. METHODS: MICs were determined by agar dilution. Sequence types (STs) were examined using N. gonorrhoeae multiantigen sequence typing (NG-MAST). Sequencing of major extended-spectrum cephalosporin (ESC) resistance determinants (penA, mtrR and ponA) was performed. RESULTS: Increases in the proportion of gonococci with decreased susceptibility or resistance to cefixime (from 18.0% in 1996-2005 to 46.0% in 2008-2016) and ceftriaxone (from 2.5% to 4.0%) were observed. Gonococcal isolates also showed increased resistance to ciprofloxacin and azithromycin. The four most prevalent NG-MAST STs with a multidrug-resistant phenotype were ST2958 (n=18), ST1407 (n=14), ST6798 (n=12) and ST4015 (n=10). The number of isolates belonging to these four STs rose between the first and second period. Among the 54 isolates belonging to the four major STs, 42 (77.8%) contained a penA mosaic allele and 12 (22.2%) contained a penA non-mosaic allele. The sequence pattern types in the 42 isolates with a penA mosaic allele included type X (64.3%), type XXXIV (33.3%) and a novel pattern type (2.4%). In contrast, all 12 isolates with the penA non-mosaic allele included the sequence pattern type V. CONCLUSION:Neisseria gonorrhoeae isolates with decreased susceptibility or resistance to ESC have increased over the years. Four major STs with a multidrug-resistant phenotype were identified. These isolates contained a penA mosaic allele or a non-mosaic allele.
Authors: Janaina Cruz Pereira; Samer S Daher; Kimberley M Zorn; Matthew Sherwood; Riccardo Russo; Alexander L Perryman; Xin Wang; Madeleine J Freundlich; Sean Ekins; Joel S Freundlich Journal: Pharm Res Date: 2020-07-13 Impact factor: 4.200