TABLE 4.

Detection sensitivities for all detection methods used

Method	No. of visible colonies at 48 h	% Sensitivity at 24 h
Epifluorescence microscopya	76	94.7
	58	100
	43	93.0
	39	94.9
	35	97.1
	29	96.6
	23	100
	21	100
	19	100
	18	100
	15	100
	8	100
	7	85.7
	5	100
	4	100
	3	100
	2	100
	2	100
	1	100
	1	100
Nucleovisionb	66	53.0
	49	65.3
	40	92.5
	35	85.7
	3	42.4
	24	45.8
	21	57.1
	16	87.5
	15	80.0
	14	92.9
	11	90.9
	10	30.0
	10	100
	10	90.0
	7	100
	6	100
	5	80.0
	4	100
	2	50.0
	2	100
	2	100
	1	100
	1	100
Nightowl (ae3)c	66	77.3
	57	73.7
	46	84.8
	26	34.6
	22	72.7
	15	100
	10	50.0
	10	90.0
	9	88.9
	8	87.5
	4	100
	4	75.0
Nightowl (ab5)d	71	81.7
	64	81.3
	33	51.5
	25	84.0
	25	100
	19	100
	12	75.0
	12	100
	6	83.3
	4	100
	2	100
	2	50

^aMean sensitivity, 98.1%. 

^bNucleovision CCD camera (strain ab5). Mean sensitivity, 80.1%. 

^cNightowl CCD camera (strain ae3). Mean sensitivity, 77.0%. 

^dNightowl CCD camera (strain ab5). Mean sensitivity, 83.9%.