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1. The Shiga toxin-producing  Escherichia coli  (STEC) is a hazardous zoonotic agent for chicken meat consumers. This study determined the serogroups and evaluated the virulence genes, antibiotic resistance, biofilm-forming profiles and genetic relationships of STEC isolates in chicken meat. 2. A total of 100 samples belonging to dressed-whole chicken and different parts of the chicken (wing, breast, thigh, drumstick) were collected between September and November 2019 from different retail markets in Kayseri, Türkiye. 3. Phenotypic (identification, disc diffusion test, Congo red agar and microtitre plate tests) and molecular tests (identification, serogrouping, virulence factors, biofilm, antibiotic susceptibility, 16S rRNA sequencing and enterobacterial repetitive intergenic consensus-PCR for typing of the isolates) were carried out. 4. E. coli  was isolated from 35% of the samples and 35% of the samples harboured at least one STEC. Among 35 STEC isolates, 3 (8.5%), 6 (17.1%), 2 (5.7%) and 3 (8.5%) were found to be positive for  fliCH2, fliCH8, fliCH11, fliCH19  genes, respectively. Out of 35 STEC positive isolates, 4 (11.4%) were identified as  E. coli  O157, from which 2 (5.7%) were  E. coli  O157:H7.  E. coli  O157 was detected in two (10%), one (5%), one (5%) of the thigh, drumstick and whole chicken samples, respectively. 5. Biofilm-forming ability was reported in 33 (94.2%) of 35  E. coli  isolates, whilst the biofilm-associated genes detected among 35 STEC isolates included  csgA  (88.5%),  fimH  (88.5%),  bcsA  (85.7%),  agn43  (14.2%) and  papC  (8.5%). The STEC strains showed resistance against ampicillin (88.5%) and erythromycin (88.5%), followed by tetracycline (74.2%) and gentamicin (25.7%). However, the distribution of isolates harbouring  blaCMY ,  ere(A), tet(A) and aac(3)-IV  antibiotic resistance genes was found to be 17.1%, 11.4%, 85.7% and 5.7%, respectively. 6. ERIC-PCR showed that  E. coli  strains obtained from different parts and whole of chicken samples had genetic diversities. ERIC-PCR patterns grouped strains of 35 STEC into eight clusters designated A-H, with 73% similarity. Proper hygiene measures and staff training are essential for public health during poultry processing and in retail stores to control STEC.

Biofilm formation, antibiotic resistance and genotyping of Shiga toxin-producing Escherichia coli isolated from retail chicken meats