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Resistance Trends Among 1,294 Nosocomial Acinetobacter baumannii Strains from a Tertiary General Hospital in China, 2014 - 2017 by Songzhe He, Zheng Li, Qiu Yang, Meilian Quan, Li Zhao, Zhu Hong

Background: To analyze the difference of the antibiotic resistance of Acinetobacter baumannii (A. baumannii) isolated from our hospital between 2014 and 2017.
Methods: We retrospectively evaluated the patients with a confirmed diagnosis of A. baumannii infection at a tertiary general hospital in Guilin during the period between January 2014 and December 2017. The following clinical and demographic data were collected: age, gender, specimens, microbiology results, and antibiotic resistance patterns of isolates. Bacterial identification and susceptibility testing were performed using MALDI-TOF MS and VITEK 2 COMPACT systems. The results were analyzed according to the Clinical and Laboratory Standards Institute (CLSI) 2018 definitions.
Results: From 2014 to 2017, 1,294 strains of A. baumannii were detected, 41.5% of which came from ICU. The sputum separation rate from ICU was significantly higher than those from non-ICU (p < 0.05). Except for amikacin, levofloxacin, and compound sulfamethoxazole, the resistant rates of the others increased year by year. Meanwhile, the resistance rate of carbapenem-resistant A. baumannii in our hospital showed a significant upward trend and exceeded the average of the national level in 2016 - 2017.
Conclusions: The drug resistance of A. baumannii has generally increased, and active measures have been taken to develop the combined application of antibiotics. Further studies should focus on the judicious use of available antibiotics and implementation of strict infection control measures to avoid the rapid spread or clonal dissemination of A. baumannii in healthcare facilities.

DOI: 10.7754/Clin.Lab.2019.190629