Antimicrobial resistance of commensal and extended-spectrum ß-lactamase/AmpC-producing Escherichia coli in organic meat chicken farms.

ABSTRACT: We examined the antimicrobial resistance of commensal Escherichia coli and occurrence of extended-spectrum beta-lactamase (ESBL)-/AmpC-producing E. coli in organic meat chicken flocks of three different fattening types using a longitudinal study design. Fourteen German small scale meat chicken farms fattening either slow-growing broiler, dual-purpose cockerels or male layer hybrids were sampled between 2023 and 2025. Throughout the fattening period, four consecutive flocks per farm were sampled five times each. Three isolates per sampling time point were picked from MacConkey agar (MCA). Additionally, MCA + 1mg/L cefotaxime (MCA+CTX) was used to selectively screen for ESBL-/AmpC-producing E. coli. In total, 696 commensal E. coli from MCA and 51 ESBL-/AmpC-producing E. coli from MCA+CTX wer

SUBMITTER: Korves-Wilm AM 

PROVIDER: S-EPMC12925275 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature