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Acinetobacter baumannii: much more than a human pathogen.

Santiago Castillo-Ramírez1, Alejandro Aguilar-Vera1, Ayush Kumar2

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Summary
This summary is machine-generated.

Acinetobacter baumannii, a common hospital pathogen, is increasingly found in diverse non-human sources. Non-human isolates generally show less antibiotic resistance, but this can increase with human contact, and their virulence potential requires further study.

Keywords:
Acinetobacter baumanniiOne Healthantimicrobial resistanceenvironmentgenomic epidemiologyinternational clonesnon-human populations

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Area of Science:

  • Microbiology
  • Epidemiology
  • Antimicrobial Resistance

Background:

  • Acinetobacter baumannii is a significant human nosocomial pathogen.
  • Recent research has expanded to investigate non-human isolates of A. baumannii.
  • Understanding the ecology and epidemiology of A. baumannii beyond clinical settings is crucial.

Purpose of the Study:

  • To review current knowledge on non-human isolates of Acinetobacter baumannii.
  • To identify trends in the sources, epidemiology, antibiotic resistance, and virulence of non-human A. baumannii.
  • To highlight knowledge gaps and suggest future research directions.

Main Methods:

  • Literature review of studies on non-human Acinetobacter baumannii isolates.
  • Analysis of trends in isolation sources, molecular epidemiology, antibiotic resistance profiles, and virulence data.
  • Synthesis of findings to identify common themes and areas for further investigation.

Main Results:

  • Acinetobacter baumannii is found in various non-human environments, including animals, food, plants, and aquatic ecosystems.
  • Two epidemiological scenarios exist: transmission between human and non-human populations (e.g., international clones IC1, IC2, IC5, IC7, IC8) or distinct human and non-human populations.
  • Non-human isolates typically possess fewer, mostly intrinsic, antibiotic resistance genes, but resistance profiles can resemble clinical isolates upon increased human contact. Some non-human isolates exhibit extensive drug resistance.
  • The virulence potential of non-human A. baumannii is understudied, with preliminary evidence suggesting it can be comparable to human isolates.

Conclusions:

  • Non-human environments serve as reservoirs for Acinetobacter baumannii, with potential for transmission to humans.
  • Antibiotic resistance patterns in non-human isolates are influenced by proximity and interaction with human populations.
  • Further research is needed to fully understand the virulence and epidemiological significance of non-human Acinetobacter baumannii in One Health contexts.