Fig. 1
Distribution of virulence genes, plasmid replicons, resistance genes and the class 1 integron-integrase (intl1 gene, as a proxy for multidrug resistance) of 62 E. coli isolated from acute and chronic salpingitis of broiler breeder hens. The phylogenetic tree is based on core genome SNP analysis and the colour codes for the most prevalent multi-locus sequence types and serotypes are illustrated under the figure