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Table 3 Number of the 95 L. monocytogenes isolates with a given growth status for each treatment condition, testing differences between persistent and sporadic isolates

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

TreatmentsaGrowth (%)bVariable (%)No Growth (%)p-valuec
PersistentSporadicPersistentSporadicPersistentSporadic
Stress Conditions in Nutritive Media (BHI)
 Control74 (100)21 (100)00001.0
 5% NaCl BHI74 (100)21 (100)00001.0
 10% NaCl BHI41 (55)10 (47)33 (45)11 (53)000.62
 pH of 5.269 (93)21 (100)5 (7)0000.58
 pH of 9.270 (95)20 (95)4 (5)1 (5)001.0
 BAC 2 μg/mL0074 (100)21 (100)001.0
 BAC 5 μg/mL0041 (55)8 (38)33 (45)13 (62)0.22
Energy Source Utilization (tested in chemically defined media [DM])
 DM Glucose38 (51)8 (38)34 (46)13 (62)2 (3)00.46
 DM Cellobiose50 (68)10 (48)24 (32)11 (52)000.12
 DM Fructose38 (51)9 (43)36 (49)12 (57)000.62
 DM Glycogen24 (32)9 (43)41 (55)11 (52)9 (12)1 (5)0.55
 DM Lactose1 (1)09 (12)2 (10)64 (87)19 (90)1.0
 DM Sucrose1 (1)015 (20)3 (14)58 (78)18 (86)0.81
  1. a See Table 1 for treatment formulations
  2. b Numbers in parentheses are the percentage of the total persistent or total sporadic isolates
  3. c p-values were determined by Chi Square Test, or Fisher’s exact test if any cells contained less than five isolates