Table 2. Mechanisms of resistance to several antimicrobials in clinical isolates of A. baumannii.

Strain	ß-lactamase	Efflux pump (RND type)	Phenotype of antimicrobial resistance
Ab 1	OXA-24 (Plasmid harbouring AbKAB TA system)	Overexpression of AdeABC/AdeIJK	Carbapenems, aminoglycosides, quinolones and glycines
Ab 2	OXA-24 (Plasmid harbouring AbKAB TA system)	Not overexpression RND efflux pump	Carbapenems
Ab 3	OXA-58	Overexpression of AdeABC/AdeFGH	Carbapenems, aminoglycosides and quinolones
Ab 4	-	Not overexpression RND efflux pump	-
Ab 5	OXA-24 (Plasmid harbouring AbKAB TA system)	Overexpression of AdeABC/AdeIJK	Carbapenems, aminoglycosides, quinolones and glycines
Ab 6	OXA-24 (Plasmid harbouring AbKAB TA system)	Overexpression of AdeABC/AdeIJK	Carbapenems, aminoglycosides, quinolones and glycines
Ab 7	-	Absence of AdeABC efflux pump/ Overexpression AdeFGH	Aminoglycosides, quinolones and glycines