TABLE 1.

Vancomycin and daptomycin susceptibilities for MRSA isolates obtained prior to and during the course of daptomycin therapy

Date (mo yr)	Specimen	Vancomycin MIC (Sa = ≤4 μg/ml)	Daptomycin zone diameter (S = ≥16 mm)	Daptomycin MIC (S = ≤1 μg/ml)
January 2004	Sputum	2.0	20	NTb
June 2004	Blood	2.0	19	0.5
July 2004	T10-T11 disk	2.0	NT	NT
August 2004	Blood	4.0	14	4.0
August 2004	T10-T11 disk	4.0	15	4.0

^aS, susceptibility breakpoint.

^bNT, not tested.