TABLE 3.
Qualitative detection of EHEC by selective or nonselective enrichment during the storage of beef salami
| Day | No. of samples positive for the indicated organism(s)/total no. of samplesa in: |
||||
|---|---|---|---|---|---|
| mTSB-N |
BPW |
||||
| O157:H7 | O157:NM | O104:H4 | O104:H4 | EHEC cocktail | |
| 21 | ND | 11/11 | 9/12 | ND | ND |
| 28 | 15/15 | 16/16 | 5/18 | 9/9 | 12/12 |
| 42 | 7/18 | 18/18 | 2/18 | 11/12 | 12/12 |
| 60 | 0/18 | 10/12 | 6/12 | 3/12 | 9/12 |
a
mTSB-N, modified Trypticase soy broth (selective enrichment); BPW, buffered peptone water (nonselective enrichment). The results of three independent experiments are presented. ND, not done (>1 log10 CFU/g).