Emergence of Haemophilus influenzae with low susceptibility to quinolones and persistence in tosufloxacin treatment
| Autor: | Atsuko Shirai, Takeaki Wajima, Yoshiaki Natsume, Shoko Ochiai, Meiwa Shibata, Naoki Hara, Shoji Seyama, Hiroyuki Shiro, Emi Tanaka, Norihisa Noguchi |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Microbiology (medical) Adult Male Haemophilus Infections Adolescent medicine.drug_class 030106 microbiology Immunology Cephalosporin Cmax Microbial Sensitivity Tests Biology Quinolones medicine.disease_cause Microbiology Persistence (computer science) Haemophilus influenzae Tosufloxacin 03 medical and health sciences Young Adult 0302 clinical medicine Bacterial Proteins Japan Drug Resistance Multiple Bacterial medicine Immunology and Allergy Humans 030212 general & internal medicine Naphthyridines Child Aged Aged 80 and over Genetic diversity Infant Middle Aged Quinolone DNA Gyrase Child Preschool Mutation Multilocus sequence typing Female medicine.drug Fluoroquinolones Multilocus Sequence Typing |
| Zdroj: | Journal of global antimicrobial resistance. 18 |
| ISSN: | 2213-7173 |
| Popis: | Background The use of non-β-lactam agents has increased in Japan due to the prevalence of β-lactam-resistant pathogens. This study aimed to clarify the recent trend of antimicrobial susceptibility and molecular epidemiological features in Haemophilus influenzae. Methods Fifty-seven Haemophilus influenzae isolated from a Japanese teaching hospital in 2017 were characterised, and the data were compared with those of a previous study. The MICs were determined using the broth dilution method. Genetic backgrounds were compared by multilocus sequence typing. The bactericidal activity of tosufloxacin at, or near, the therapeutic Cmax was determined in vitro, with susceptible isolates and quinolone low-susceptible isolates by time-kill assay. Results The results of the susceptibility tests showed that > 90% of isolates were susceptible to cephalosporins and carbapenems, whereas ampicillin-susceptible and clarithromycin-susceptible isolates decreased. Regarding quinolones, low-susceptible isolates were noted in 2017, although all isolates were judged as susceptible. All low-susceptible isolates had an amino acid substitution in GyrA, and two isolates had an additional substitution in ParC. These isolates had different genetic backgrounds. Furthermore, the time-kill kinetic assay using the Cmax of tosufloxacin indicated that the low-susceptible isolates could persist for at least 8 hours. Conclusions This study revealed that Haemophilus influenzae has demonstrated multidrug low-susceptibility in recent years. The low-susceptible isolates had genetic diversity, meaning that resistance occurred independently. |
| Databáze: | OpenAIRE |
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