Abstract
Enterobacteriaceae have displayed widespread trends of antimicrobial resistance in recent years. Therefore, we aimed to analyse the antimicrobial susceptibility of common bacteria and explore the significance in treatment and research of infections induced by Enterobacteriaceae. We retrospectively analysed 10,775 antimicrobial susceptibility test results acquired over a 6-year period in the affiliated hospital of Chengde Medical University. We divided the data based on specimen type (blood, sputum, pus, or urine), and population characteristics (age bracket and sex) for analysis. We mainly analysed the antimicrobial susceptibility of Escherichia coli (Eco), Klebsiella pneumoniae (Kpn), and Enterobacter cloacae (Ecl). In our study, it was found that the resistance rates of Eco, Kpn, and Ecl to most antimicrobial agents were significantly different (P < 0.05) on specimen type and age bracket. The Eco from sputum had the highest resistance rates except ciprofloxacin (CIP), levofloxacin (LVX), and gentamicin (GEN); the Kpn from urine had the highest resistance rates to all antimicrobial agents; the Ecl from urine had the highest resistance rates to most antimicrobial agents. The Eco from geriatric patients had the highest resistance rates except GEN and SXT; the Kpn from adult patients had the lowest resistance rates to most antimicrobial agents except LVX. The Eco isolated from males had higher resistance rates to most antimicrobial agents except CIP, LVX, and NIT than those isolated from females; the Kpn showed significant differences in antimicrobial susceptibility to only 5 out of 22 antimicrobial agents (P < 0.05); the Ecl showed significant differences in susceptibility only to two antimicrobial agents, LVX and TOB (P < 0.01). The antimicrobial susceptibility of Enterobacteriaceae was significantly different among specimen type, age bracket and sex of patients, which is of great significance for the treatment and research of infection.
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