TABLE 1.

Sites participating in quality control studies

Participant	Institution, city, and state or province
S. Brown	Clinical Microbiology Institute, Wilsonville, OR
M. Baumana	St. Vincent's Hospital, Portland, OR
M. Coxb	Anaerobe Systems, Morgan Hill, CA
M. J. Ferraroa	Massachusetts General Hospital, Boston, MA
D. Hardy	Univ. of Rochester Medical Center, Rochester, NYd
J. Hindler	UCLA Medical Center, Los Angeles, CA
S. Jenkinsa	Carolinas Medical Center, Charlotte, NC
C. Knapp	TREK Diagnostic Systems, Westlake, OH
G. Overturfa	Univ. New Mexico Medical Center, Albuquerque, NM
G. Procop	Cleveland Clinic, Cleveland, OH
R. Rennie	Univ. of Alberta Hospital, Edmonton, Alberta, Canada
M. Saubollea	Good Samaritan Hospital, Phoenix, AZ
E. J. Baronc	Stanford Univ. Hospital and Clinics, Stanford, CA
F. Tenoverc	Centers for Disease Control and Prevention, Atlanta, GA

^aS. aureus, E. coli, and E. faecalis MIC study only.

^bDisk diffusion study only.

^cS. pneumoniae and H. influenzae MIC study only.

^dUniv., university.