Heat map for the investigated diarrheagenic E. coli isolates, depending on the existence of virulence genes, antimicrobial resistance, and serotypes. The blue and red colors represent the sensitivity and resistance to particular antimicrobial drugs, and the absence and presence of certain serotype and virulence genes, respectively. The DEC isolates from human (H), cow (C) and equine (E) sources are coded on the right of the heat map. AMP: ampicillin, CPZ: cefoperazone, AMC: amoxicillin/clavulanic acid, CPM: cefepime, ATM: aztreonam, E: erythromycin, FOX: cefoxitin, TZP: piperacillin/tazobactam, IPM: imipenem, C: chloramphenicol, CN: gentamycin, CIP: ciprofloxacin, SXT: sulfamethoxazole/trimethoprim, and TE: tetracycline.