TABLE 2.

Inter- and intralaboratory comparisons of retapamulin zone diameter results^a

Zone diam (mm)	No. of occurrences of organism in laboratory:
	A	B	C	D	E	F	G	H	Total
S. aureus ATCC 25923
21									0
22						1			1
23			6			2	12	7	27b
24	3		9			11	28	24	75b
25	21	4	21		3	17	20	8	94b
26	36	8	21		20	18		16	119b
27		20	3	1	32	6		4	66b
28		17		14	5	5		1	42b
29		11		19					30b
30				21					21b
31				5					5
32									0
S. pneumoniae ATCC 49619
11									0
12	4								4
13	28								28c
14	26	9	13			19			67c
15	2	19	29	30	1	21			102c
16		18	6	13	21	10	3		71c
17		6	11	12	14	6	13		62c
18		8	1	5	15	4	18		51c
19					9		19		28c
20							6		6
21							1		1
22									0

^aResults represent testing of two QC strains for an eight-medical-center protocol meeting the study design guidelines found in CLSI M23-A2 (4).

^bProposed QC range (23 to 30 mm) that included 98.8% of reported zone diameters from eight laboratories.

^cProposed QC range (13 to 19 mm) that included 97.4% of reported zone diameters from seven laboratories (laboratory H results were omitted from analysis).