“For both the type A (i.e., possessing transferable resistance to teicoplanin and vancomycin) and … type B (i.e., possessing teicoplanin susceptibility and nontransferable vancomycin resistance) resistant strains, vancomycin MICs in … presence of glycine were substantially lower than those in unsupplemented broth (… of MIC decrease, 8- to 128-fold).”