Figure 3

Heatmap and hierarchical clustering of E. coli isolates according to their phenotypic (antibiotic resistance) and genotypic (antibiotic resistance genes) profile of variables showing differences between isolates. Red represent presence and green represented absence of resistance or gene. Left of the heatmap is color representation of the different sources (hatchling in green and hatchery in red), the different serotypes, and the different hatcheries. Hierarchical clustering was perform using Wald’s method and a binary distance matrix. Letters designate the 3 main clusters described in the text.