Fig. 1

Flow chart of the isolates included in the study. List of excluded bacterial species: *Citrobacter spp.: 9, Enterobacter aerogenes: 1, Klebsiella oxytoca: 1, Proteus mirabilis: 1, Enterococcus faecalis: 3; †Citrobacter spp.: 2, Enterococcus cloacae: 1, Proteus penneri: 1; ‡Citrobacter spp.: 2