LARGE NUMBER OF RESISTANT GENES. “the Antibiotic Resistance Genes Database (ARDB). The treatment of infections is increasingly compromised by the ability of bacteria to develop resistance to antibiotics … Currently, ARDB contains … 13,293 genes, 377 types, 257 antibiotics, 632 genomes, 933 species and 124 genera.”
http://nar.oxfordjournals.org/content/37/suppl_1/D443.long