Whole genome data analysis from a one health perspective reveals global landscape of antimicrobial resistance in Campylobacter jejuni over the past decade, revealing striking prevalence of aminoglycoside, tetracycline, and macrolide resistance genes in Asia.

This study presents a comprehensive global analysis of the antimicrobial resistance (AMR) landscape in Campylobacter jejuni, a leading cause of foodborne diarrheal disease and a priority pathogen with increasing resistance. By utilizing whole-genome sequencing (WGS), 883 publicly available C. jejuni genomes from the Bacterial and Viral Bioinformatics Resource Center (BV-BRC), spanning the years 2013-2023, were analyzed. These genomes were sourced from various geographic regions and hosts, including avian, human, and non-human mammals. Key findings revealed significant geographic and host-specific variations in AMR gene profiles, highlighting the widespread prevalence of efflux pump genes (cmeA, cmeB, cmeC, cmeR) and β-lactamases (blaOXA variants) across all regions, contributing to broad-spectrum resistance. Tetracycline resistance genes (tet(L), tet(O)) and macrolide resistance genes (ermB) exhibited substantial distribution variability, particularly in avian and human hosts, with Asia showing higher resistance gene prevalence. Emerging resistance to aminoglycosides and oxazolidinones was also detected, indicating evolving resistance mechanisms in C. jejuni. The study underscores the critical importance of a One Health approach to managing AMR in C. jejuni, integrating human, animal, and environmental health data. These findings have significant implications for the development of targeted antibiotic stewardship programs, particularly in regions with higher AMR gene prevalence such as Asia. Moreover, the research calls for increased surveillance in underrepresented regions and further investigation into the evolutionary dynamics of AMR gene dissemination. This work provides a vital foundation for informing global public health strategies and advancing research into resistance mechanisms in C. jejuni.