“…The comparative in vivo studies that have been done indicate that there is no notable difference between tobramycin and gentamicin against Enterobacteriaceae [11,15,16], and that tobramycin is somewhat more effective than gentamicin in treating infections caused by Pseudomonas [1,5,6,13,14], If this is confirmed by further in vivo studies, it will indicate that the PDM medium is not suitable for sensitivity testing of Enterobacteriaceae and Pseudomonas spp. against the two most commonly used aminoglycosides.…”