Fig. 1

Molecular and phenotypic characterization of 15 Escherichia coli strains isolated from broilers with osteomyelitis and arthritis. Black and white boxes represent positive and negative results, respectively. Flock ID, number of the flock of origin; Lesion, VO: vertebral osteomyelitis, Art: arthritis; Serotype, ns: non-serotyped; Flagella, nm: non-motile, nc: non-correspondent to any flagellar type tested; ST, Sequence type; ECOR: ECOR phylogenetic group; APEC (Johnson et al.): APEC diagnosis according to Johnson et al. (2008); APEC (Schouler et al.); APEC diagnosis according to Schouler et al. (2012); Yes: APEC strain, No: non-APEC strain; pVAGs, pattern of virulence genes described by Schouler et al. (2012), nc: non-correspondent to the described patterns; Iron acquisition, genes encoding iron acquisition system; Adhesin, genes encoding adhesins; Toxin, genes encoding toxins; Protectin, genes encoding protectins; Invasin, genes encoding invasins; Miscellaneous, genes encoding different kinds of virulence; VAGs (%), percentage of APEC-associated virulence genes; Lethality score, number of chicks that died at the fourth day post-infection with E. coli; Serum resistance, R: serum resistant strain, I: intermediate resistant strain, S: serum sensitive strain; N° resistant AB: number of antibiotics to which the strain was resistant; Antibiotic resistance profile: gentamicin, Gen; neomycin, Neo; apramycin, Apr; amoxicillin, Amx; amoxicillin + clavulanic acid, Amc; cephalotin, Cef; cefoxitin, Fox; ceftiofur, Xnl; florfenicol, Ffc; colistin, Cst; nalidixic acid, Nal; flumequine, UB; enrofloxacin, Enr; trimethoprim, Tmp; Tmp + sulfamethoxazole, TmpStx; tetracycline, Tet; pansusceptible, PanSus