Figure 1
**Unrooted Bayesian phylogenetic tree of the 760 isolates using the 16S rRNA gene sequences.** The scale bar represents 1.0 expected changes per nucleotide position. The nodes are color-coded according to the antibiotics used to isolate the strains, but the area is not proportional to the number of isolates from that antibiotic. The width of the node is in proportion to the number of isolates in each node. The antibiotics are designated as follows: Amp – ampicillin, Cam – chlorapmhenicol, Kan – kanamycin, Nor – norfloxacine, Tet – tetracycline. The numbers indicate genera as follows: 1 – *Flexibacteriaceae*, 2 – *Sphingobacterium*, 3 – *Pedobacter*, 4 – *Flavobacterium*, 5 – *Elizabethkingia*, 6 – *Chryseobacterium*, 7 – *Deinococcus*, 8 – *Brachybacterium*, 9 – *Microbacteriaceae*, 10 – *Cellulomonadaceae*, 11 – *Micrococcaceae*, 12 – *Nocardiaceae*, 13 – *Nocardioidaceae*, 14 – *Sanguibacter*, 15 – *Bacillales*, 16 – *Sphingomonadaceae*, 17 – *Hyphomicrobiaceae*, 18 – *Caulobacteraceae*, 19 – *Ensifer*, 20 – *Alcaligenaceae*, 21 – *Oxalobacteriaceae*, 22 – *Incertia cedis*, 23 – *Comamonadaceae*, 24 – *Aeromonas*, 25 – *Enterobacteriaceae*, 26 – *Acinetobacter*, 27 – *Pseudomonas*, 28 – *Xanthomonadaceae*.