Table 2.

Percentage of Pseudomonas aeruginosa Isolates Susceptible to Piperacillin Prior to and After Implementation of Clinical and Laboratory Standards Institute 2012 Changes, Using All First Positive Blood Culture Isolates in Children From 2001 to 2010 at Johns Hopkins Hospital

	Prior to Revised Breakpoints	After Implementation of Revised Breakpoints	Percent Change
Susceptible	225	163	↓ 27.6%
Intermediate	…a	62	…
Resistant	7	7	…

^a No intermediate range defined for piperacillin prior to breakpoint revision.