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Table 1 Breakpoints used to determine resistance and susceptibility to antimicrobial therapy

From: Lobar pneumonia caused by Ralstonia pickettii in a sixty-five-year-old Han Chinese man: a case report

Antimicrobial Agent Disk Content Zone Diameter Breakpoints, nearest whole mm
   S I R
mezlocillin 75 μg 16 - 15
ceftazidime 30 μg 18 15-17 14
cefoperazone 75 μg 21 16-20 15
ceftriaxone 30 μg 21 14-20 13
imipenem 10 μg 16 14-15 13
aztreonam 30 μg 22 16-21 15
gentamicin 10 μg 15 13-14 12
ciprofloxacin 5 μg 21 16-20 15