Table 8. MIC breakpoints (mg/l) used to assign susceptibility categories.

Antibiotic	Susceptible	Intermediate	Resistant
Tobramycin	≤ 4	-	> 4
Ciprofloxacin	≤ 0.5	1	> 1
Colistin	≤ 2	-	> 2
Trimethoprim	≤ 0.5	-	> 4
Meropenem	≤ 4	8	≥ 16
Aztreonam	≤ 4	-	> 8
Ceftazidime	≤ 8	16	≥ 32
Tetracycline	≤ 1	-	> 2