ArticlePoultry science2026
Influence of housing system on antimicrobial resistance and population structure of extended-spectrum beta-lactamase-producing Escherichia coli in South Korean layer farms.
Article in Poultry science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Extended-spectrum β-lactamase (ESBL)-producing Escherichia coli are widespread in poultry production, posing serious public health risks. However, evidence from commercial layer farms-particularly environmental reservoirs-and direct comparisons between cage and floor housing systems remain limited. In this study, we aimed to investigate the prevalence, antimicrobial resistance (AMR) profiles, β-lactamase genotypes, and clonal diversity of ESBL-producing E. coli in floor- and cage-housed layer farms in South Korea to inform AMR risk assessment and control strategies. Eighty ESBL-producing E. coli isolates were recovered from 34 environmental samples collected across six farms (three floor-housed and three cage-housed layer farms). All isolates exhibited high resistance to ampicillin and third-generation cephalosporins, whereas susceptibility to imipenem and amikacin was retained. Resistance to tetracycline (45.2% vs. 15.8%; P = 0.005), chloramphenicol (64.3% vs. 31.6%; P = 0.005), and trimethoprim-sulfamethoxazole (54.8% vs. 18.4%; P = 0.001) was higher among floor-housed than cage-housed isolates, resulting in a higher prevalence of multidrug resistance in floor-housed isolates. Genotypic analysis identified blaCTX-M-14 (27.5%) and blaCTX-M-55 (21.3%) as the most prevalent ESBL genes. Among non-ESBL β-lactamase genes, blaTEM-30 and blaTEM-116 were more frequent in floor-housed isolates, whereas blaTEM-163 predominated in cage-housed isolates. Multilocus sequence typing showed reduced clonal diversity in floor-housed isolates, dominated by ST1718 and ST10, whereas cage-housed isolates displayed broader, more heterogeneous lineages. These findings indicate the association of layer housing systems with differences in AMR burden, β-lactamase allele distribution, and clonal structure of ESBL-producing E. coli, supporting housing-tailored biosecurity and farm-level surveillance to mitigate dissemination in layer production.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.