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Characterization of a small plasmid carrying the carbapenem resistance gene bla OXA-72 from community-acquired Acinetobacter baumannii sequence type 880 in China.

Abstract：

Background:Acinetobacter baumannii has emerged as an important pathogen associated with hospital- and community-acquired infections. Community-acquired A. baumannii pneumonia is characterized by a fulminant course and high mortality rates. In this study, we report the identification of a community-acquired carbapenem-resistant A. baumannii strain carrying the blaOXA-72 gene. Methods:This A. baumannii isolate was recovered from a male patient diagnosed with community-acquired pneumonia, septic shock, and respiratory failure. Antimicrobial susceptibility testing were performed and the minimum inhibitory concentrations were determined by the broth microdilution method. Whole-genome sequencing was performed using both long-read MinION and short-read Illumina platforms to fully characterize the blaOXA-72-carrying plasmid of the A. baumannii A52. The in silico multilocus sequence typing and genomic epidemiological analysis of the closely related isolates were further elucidated by our recently updated BacWGSTdb server. Results:The isolate was resistant to meropenem and remained susceptible to several other antimicrobial agents. Whole-genome sequencing and bioinformatics analysis indicated that this A. baumannii isolate belonged to the rare sporadic clone sequence type 880 and the blaOXA-72 gene was located on the 8,493-bp plasmid pA52-OXA-72. This plasmid exhibited only partial similarity to different OXA-72-encoding plasmids (size range: 8,771-12,056 bp) in various Acinetobacter spp. recovered from patients and other reservoirs in different countries. Conclusion:This study described the first case of fulminant carbapenem-resistant community-acquired A. baumannii pneumonia caused by a rare sporadic clone in China. Adequate surveillance is warranted to monitor the emergence of A. baumannii as a community pathogen.

journal_name

Infect Drug Resist

journal_title

Infection and drug resistance

authors

Jia H,Sun Q,Ruan Z,Xie X

doi

10.2147/IDR.S202803

subject

Has Abstract

pub_date

2019-06-06 00:00:00

pages

1545-1553

issn

1178-6973

pii

202803

journal_volume

pub_type

杂志文章

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Characterization of a small plasmid carrying the carbapenem resistance gene bla OXA-72 from community-acquired Acinetobacter baumannii sequence type 880 in China.