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Table 1 Prevalence and contamination level of B. cereus in different edible fungi

From: Assessment and molecular characterization of Bacillus cereus isolated from edible fungi in China

Sample

Contamination rate (%) a

MPN value (MPN/g) b

Positive sample

contamination level (MPN/g) c

MPN < 3

3 ≤ MPN < 1100

1100 ≤ MPN

Flammulina velutiper

20.6 (45/218)

13/45 (28.9%)

31/45 (68.9%)

1/45 (2.2%)

55.5

Pleurotus ostreatus

34.5 (39/113)

4/39 (10.3%)

33/39 (84.6%)

2/39 (5.1%)

91.7

Lentinus edodes

57.8 (63/109)

5/63 (7.9%)

58/63 (92.1%)

0/63 (0.0%)

24.6

Pleurotus eryngii

14.7 (14/95)

4/14 (28.6%)

10/14 (71.4%)

0/14 (0.0%)

6.8

Hypsizygus marmoreus

16.0 (15/94)

2/15 (13.3%)

13/15 (86.7%)

0/15 (0.0%)

49.9

Other species

31.4 (22/70)

3/22 (13.6%)

17/22 (77.3%)

2/22 (9.1%)

113.3

Total

28.3 (198/699)

31/198 (15.7%)

162/198 (81.8%)

5/198 (2.5%)

55.4

  1. aContamination rate = Number of positive samples/Total samples;
  2. bMPN value (MPN/g) = Most probable number of B. cereus per gram sample;
  3. cPositive sample contamination levels (MPN/g) = Sum of MPN values for positive sample/weight of positive samples.