Researchers Identified Multidrug-Resistant Strain in Europe
Genomic analysis revealed a transnational cluster of Campylobacter coli circulating across nine nations.
Updated on Oct. 8, 2026 in Diseases — General
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Scientists identified a multidrug-resistant lineage of Campylobacter coli, known as ST10042, circulating across nine European countries between August 2018 and December 2025. The study utilized genomic analysis to link human, animal, and environmental isolates, confirming transnational transmission clusters.
Why it matters
The identification of this multidrug-resistant strain highlights risks associated with foodborne pathogens, particularly through poultry, which accounted for the vast majority of non-human isolates. Understanding the genomic distribution of this bacteria is essential for monitoring antimicrobial resistance across borders.
Researchers studied 217 isolates, with 83 percent of non-human samples originating from poultry. All 98 tested Portuguese isolates exhibited resistance to ciprofloxacin, tetracycline, and ampicillin.
The details
The research team used whole genome sequencing to trace the movement of the ST10042 lineage across Europe, finding significant cross-border clustering. Variations in the porA gene were identified as a key factor influencing the pathogen's susceptibility to specific antibiotics like ertapenem.
Timeline
Collection of study isolates began in August 2018.
ST10042 was the most prevalent C. coli type in Portugal from 2021 to 2025.
The study collection period concluded in December 2025.
The Big Picture
This study follows a pattern set by the 2018 Cyclospora outbreak linked to McDonald's salads by using genomic mapping to identify transnational transmission pathways. The research demonstrates how advanced sequencing shifts the ability to track foodborne pathogens compared to traditional epidemiological methods.
The rise of multidrug-resistant bacteria complicates standard treatment protocols for foodborne illnesses. Patients presenting with persistent digestive symptoms should remain aware of potential antibiotic resistance profiles that may require targeted medical interventions.
The takeaway
The spread of resistant strains across national borders underscores the need for standardized food safety and surveillance protocols. Consumers should continue to follow rigorous hygiene and cooking practices to minimize exposure to contaminated poultry products.
Further reading
Learn more about current trends in infectious illnesses on the Diseases — General page.
Source note: This article includes information reported by Food-safety.
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