Acinetobacter baumannii Sampled from Cattle and Pigs Represent Novel Clones

Area of Science:

• Microbiology
• Genomics
• Epidemiology

Background:

• Acinetobacter baumannii is a significant human pathogen, yet knowledge of its non-human isolates remains limited.
• Understanding the genomic diversity and characteristics of animal-associated A. baumannii is crucial for a comprehensive One Health approach.

Purpose of the Study:

• To determine the genomic identity of Scottish cattle and pig isolates of A. baumannii.
• To identify antibiotic and virulence genetic determinants in these animal isolates.
• To compare animal isolates with major international clones of human clinical A. baumannii.

Main Methods:

• Whole-genome sequencing of 15 Scottish cattle and pig A. baumannii isolates.
• Comparative genomic analysis against a dataset of 148 genomes from major human clinical international clones.
• Bioinformatic identification of antibiotic resistance and virulence genes.

Main Results:

• Cattle and pig isolates represent novel A. baumannii clones, genetically distinct from major international clones.
• These novel animal-associated clones exhibit a reduced number of antibiotic resistance genes compared to human clinical isolates.
• Preliminary findings suggest these new clones may also possess fewer virulence genes than their human counterparts.

Conclusions:

• Animal isolates of A. baumannii can represent distinct clonal lineages separate from those dominating human infections.
• The genomic profile of these novel animal clones indicates a potentially lower public health risk regarding antibiotic resistance and virulence.
• Further research into animal-associated A. baumannii is essential to understand pathogen evolution and transmission dynamics.