Table 3.

Competitive Indexes of co-cultured listerial strains over a 14-days period in biotic soil microcosms.

Time (Days)	Response-negative mutant/parental strain	Signal-negative mutant/parental strain	Response-negative mutant/signal-negative mutant
0	1	1	1
2	0.54	0.31*	0.80
4	0.20*	0.31	0.50
7	0.25*	1.26	0.49
14	0.26*	1.74	1.95

^*Indicates when the CI significantly differed from the time 0 (repeated-measures ANOVA, Tukey, P < 0.05).