Table 2.

Effect of cell concentration on the detection times.

	Detection time (hours)
Cell concentration	S1400/94	869'	128'
104 (a)	2.5 ± 0.1	2.6 ± 0.2	2.5 ± 0.2
105 (b)	1.8 ± 0.2	2.0 ± 0.1	1.9 ± 0.2
106 (c)	1.3 ± 0.1	1.1 ± 0.2	1.3 ± 0.2
107 (d)	0.8 ± 0.1	0.8 ± 0.2	0.9 ± 0.1
108 (e)	3.8 ± 0.1	3.5 ± 0.2	3.7 ± 0.2
109 (f)	—	—	—

Note: Means and standard deviations are based on three experiments in duplicate.