TABLE 5.

Comparisons of recovery rates for stress-exposed Salmonella serovar Enteritidis, E. coli O157:H7, and L. monocytogenes cells in TSBYE, SEL, and the respective individual selective enrichment broths^a

Stress or condition	Organism	Log10 CFU/ml (mean ± SD) at 0 h	Log10 CFU/ml (mean ± SD) at 3 h in:			Log10 CFU/ml (mean ± SD) at 6 h in:
			TSBYE	Selective enrichment brothb	SEL	TSBYE	Selective enrichment brothb	SEL
Temp (°C)	Salmonella serovar
37	Enteritidis	7.27 ± 0.24	8.81 ± 0.20*	8.35 ± 0.15	8.29 ± 0.28	9.23 ± 0.10*	8.41 ± 0.29	9.27 ± 0.14
4		6.25 ± 0.14	8.31 ± 0.34*	7.35 ± 0.48*	7.66 ± 0.22*	9.10 ± 0.05*	8.40 ± 0.05*	9.21 ± 0.14*
pH
4.5		5.20 ± 0.54	7.22 ± 0.02*	5.39 ± 0.68	5.07 ± 0.00	7.33 ± 0.07*	5.83 ± 1.05	4.89 ± 1.06
5.5		6.69 ± 0.02	8.71 ± 0.26*	8.25 ± 0.36*	8.28 ± 0.28*	9.05 ± 0.06*	8.53 ± 0.09*	9.35 ± 0.17*
Temp (°C)	E. coli O157:H7
37		7.16. ± 0.11	8.63 ± 0.11*	7.53 ± 0.10	7.84 ± 0.07	9.02 ± 0.11*	8.08 ± 0.18	8.73 ± 0.17
4		5.57 ± 0.09	8.02 ± 0.14*	5.02 ± 0.73	5.77 ± 0.91	8.86 ± 0.07*	4.90 ± 0.49	7.80 ± 0.23*
pH
4.5		5.08 ± 0.36	6.43 ± 0.11*	3.21 ± 0.28	3.54 ± 0.28	8.56 ± 0.49*	3.66 ± 0.68	5.24 ± 0.37
5.5		6.69 ± 0.15	8.43 ± 0.11*	6.89 ± 0.13	7.43 ± 0.21	9.02 ± 0.13*	6.99 ± 0.60	8.66 ± 0.20*
Temp (°C)	L. monocytogenes
37		7.56 ± 0.04	8.72 ± 0.03*	8.20 ± 0.10	8.38 ± 0.12	9.60 ± 0.10*	8.78 ± 0.10	9.17 ± 0.16
4		6.57 ± 0.08	8.04 ± 0.08*	7.28 ± 0.10	7.67 ± 0.08*	9.06 ± 0.10*	8.36 ± 0.07*	8.88 ± 0.09*
pH
4.5		6.42 ± 0.17	7.60 ± 0.18*	6.74 ± 0.08	7.33 ± 0.11*	9.22 ± 0.49*	7.75 ± 0.09*	8.06 ± 0.64*
5.5		6.71 ± 0.04	8.23 ± 0.10*	7.46 ± 0.10	7.91 ± 0.16*	9.56 ± 0.03*	8.41 ± 0.06*	8.99 ± 0.09*

^aEach culture was inoculated at 3 × 10² CFU/ml. Values marked with * indicate the recovery of stressed cells as defined by an increase in cell numbers of ≥1 log in the given medium compared to the initial numbers after stress.

^bThe selective enrichment broths were RV broth for Salmonella serovar Enteritidis, mEC+n for E. coli, and FB for L. monocytogenes.