Det er imidlertid sårbart over for kromosomalt indkodede multistof efflukspumper for Proteeae (se nedenfor) og Pseudomonas aeruginosa (MexXY- OprM efflukssystem).
However, it is vulnerable to chromosomally-encoded multidrug efflux pumps of Proteeae (see below) and Pseudomonas aeruginosa (MexXY-OprM efflux system).