Table 1

Number (%) of isolates in stated category of susceptibility to antimicrobial agents at given concentrations (μg/ml)

Antimicrobials and break points*SusceptibleIntermediateResistant
*In some instances (e.g. gentamicin) there is a range of MICs between the break points counting as intermediate; in others (e.g. ceftazidime) no intermediate range is recognised by BSAC.11
Gentamicin (⩽1; ⩾8)55 (13.2)166 (40.0)196 (47.0)
Tobramycin (⩽1; ⩾8)230 (55.1)145(34.6)42 (10.1)
Ceftazidime (⩽8; ⩾16)252 (60.4)165 (39.6)
Ciprofloxacin (⩽1; ⩾8)182 (43.6)111 (26.6)124 (29.7)
Piperacillin (⩽16; ⩾32)284 (68.1)133 (31.9)
Colistin (⩽4; ⩾8)404 (96.9)13 (3.1)