Skip to main content

Table 2 Number of the 95 L. monocytogenes isolates with a given growth status for each treatment condition

From: Persistent and sporadic Listeria monocytogenes strains do not differ when growing at 37 °C, in planktonic state, under different food associated stresses or energy sources

Treatmentsa

Growth

Variable

No Growth

p-valueb,c

Stress Conditions (tested in nutritive media [BHI])

 Control

95

0

0

 5% NaCl

95

0

0

No test

 10% NaCl

51

44

0

2.2 × 10–16

 pH of 5.2

90

5

0

0.059

 pH of 9.2

90

5

0

0.059

 BAC 2 μg/mL

0

95

0

2.2 × 10−16

 BAC 5 μg/mL

0

49

46

2.2 × 10− 16

Energy Source Utilization (tested in chemically defined media [DM])

 DM Control

46

47

2

 DM Cellobiose

60

35

0

0.052

 DM Fructose

47

48

0

0.62

 DM Glycogen

33

52

10

0.021

 DM Lactose

1

11

83

2.2 × 10−16

 DM Sucrose

1

18

76

2.2 × 10− 16

  1. a See Table 1 for formulations of each treatment
  2. b p-values, for the Fisher’s Exact test, for difference in growth response category between control and individual treatments in the same stress condition or energy source test category
  3. c Bolded p-values are statistically significant at p < 0.05