Figure 1. The distribution of 298 antibiotic resistance genes assigned to specific strains. The classification of the strains was according to the NCBI taxonomy feature: (A) gram positive or gram negative; (B) environment/host/reservoir; (C) anaerobic/aerobic/facultative; and (D) temperature growth characteristics, e.g., mesophilic, psychrophilic, etc. The taxonomic affiliation analysis was based on the use of the MEtaGenome Analyzer (MEGAN, version 3.9) (LCA parameters: mini-score 35, top percentage 10%).