Table 2.

Characteristics of Group of Pseudomonas aeruginosa Strains (n=150)

Group I (n=22)	Strains susceptible to all tested β-lactams
Group II (n=40)	Strains (resistant/not susceptible) to karbapenems and susceptible to other β-lactams
Group III (n=67)	Strains resistant to all tested β-lactams, MBL-negative; XDR strains
Group IV (n=13)	Strains resistant to all tested β-lactams, MBL-positive; XDR strains
Group V (n=8)	Strains susceptible to karbapenems with variable pattern of resistance to other β-lactams; MDR strains