molecular and genetic analysis of multiresistant isolates of staphylococcus aureus from widely separated hospitals in australia has demonstrated that these are clearly related , and that the predominant strains possess up to three different plasmids , which fall into the following classes : ( i ) small 1.6 kb plasmids , such as psk3 , which are phenotypically cryptic , ( ii ) 4.5 kb chloramphenicol resistance plasmids , such as psk2 , and ( iii ) the psk1 family of multiresistance plasmids , which range in size from 20 to 42 kb and variously encode resistance to antiseptics and disinfectants , trimethoprim ( tpr ) , penicillin ( pcr ) and the aminoglycosides gentamicin , tobramycin and kanamycin ( gmr tmr kmr ) .
C0002556
aminoglycosides
C0022487
kanamycin