TABLE I

Accuracy Percent Recovery ScanRDI Versus Reference Plate Count Method

Test Organism	Dilution	Mean Counts ScanRDI	Mean cfu	% Recovery
Staphylococcus aureus ATCC 6538	1.0	228	230	99.1
	1.428	163	156	104.5
	2.5	99	102	97.0
	5.0	45	55	81.8
	20	10	12	N/A
	40	6	8	N/A
Pseudomonas aeruginosa ATCC 9027	1.0	112	133	84.2
	1.428	78	84	92.8
	2.5	41	54	75.9
	5.0	20	21	N/A
	20	4	5	N/A
	40	3	3	N/A
Escherichia coli ATCC 8739	1.0	207	195	106.1
	1.428	146	131	111.5
	2.5	88	78	112.8
	5.0	39	43	90.7
	20	13	9	N/A
	40	7	5	N/A
Candida albicans ATCC 10231	1.0	144	143	100.7
	1.428	108	114	94.7
	2.5	57	65	87.7
	5.0	28	29	96.5
	20	7	8	N/A
	40	5	8	N/A
Aspergillus brasiliensis ATCC 16404	1.0	96	100	96.0
	1.428	58	34	170.6
	2.5	26	42	61.9¹
	5.0	19	12	158.3
	20	4	4	N/A
	40	5	3	N/A
Bacillus atrophaeus NRRL B4418 (spores)	1.0	85	96	88.5
	1.428	55	50	110.0
	2.5	37	27	137.0
	5.0	18	21	N/A
	20	5	4	N/A
	40	4	3	N/A

cfu = Colony-forming units (reference plate count method).
N/A = Not applicable. Reference plate count cfu less than the minimum required for accurate counting.
↵1 Recovery <70%. See text.