M. SAIDANI1, 2*, I. TABIB1, A. CHAOUECHI1, S. ZOUAOUI1, A. SOUDANI1, M. HAENNI3, M. DÂALOUL1, F. BEN CHEHIDA1, A. MAMLOUK1, CH. CHAKROUN4, J-Y. MADEC3, L. MESSADI1
1 Laboratory of microbiology, National School of Veterinary Medicine, University of La Manouba, Sidi Thabet, Tunisia.
2 National Agronomic Institute of Tunisia, University of Carthage, Tunis, Tunisia.
3 National Agency of Sanitary Security (ANSES), Antibiotic resistance and Bacterial Virulence Unit, Lyon, France.
4 Interprofessional Grouping of Poultry and Rabbit Products (GIPAC), Tunis, Tunisia
Abstract – The aim of the present study was to evaluate resistance to antimicrobial agents of bacteria isolated from mastitis cows, diarrheic and healthy calves, and healthy chickens. Therefore, a total of 679 animals were sampled; milk samples from mastitis cows (n=248), fecal specimens from calves (n=119) and fresh feces from healthy chickens (n=312) to isolate Eschrichia coli strains then evaluate their susceptibility to 17 antimicrobial agents. Escherichia coli were the commonest bacteria isolated from milk of mastitis cows (38%). The carriage rate of E. coli from fecal samples of diarrheic and healthy calves was 86.6% and 88.1% respectively. In poultry, the carriage rate was 90.7%. Resistance to antibiotics was higher in E. coli isolated from chickens then from calves and mastitis cows. The highest prevalence of ESBL producing E. coli was also obtained in feces samples of chickens 14.5% which are considered as a major ESBL reservoir in Tunisia.