TABLE 1.
E. coli strains used
| Serotype | Strain | Description | Source (reference) |
|---|---|---|---|
| O157:H7 | C9490 | Clinical isolate associated with hamburger patty | M. P. Doyle |
| O157:H7 | 30-2C4 | Clinical isolate associated with dry-cured salami | M. P. Doyle |
| O157:H7 | W2-2 | Poultry isolate | M. P. Doyle |
| O157:H7 | H1071 | Clinical isolate | M. F. Patterson |
| O157:H7 | NCTC 12079 | Clinical isolate | M. F. Patterson |
| O157:H7 | ATCC 43895 | Clinical isolate associated with raw hamburger meat | M. T. Rowe (4) |
| O157:H7 | FRIK 816-3 | ATCC 43895 rpoS::pRR10 | M. T. Rowe (4) |
| O124 | NCTC 8003 | Clinical isolate | M. F. Patterson |
| K−:H− | BJ4 | Streptomycin-resistant rat gut isolate | K. McClean (15) |
| K−:H− | BJ4L1 | rpoS null mutant | K. McClean (15) |
| K−:H− | BJ4L1C | BJ4L1(pCR2.1), encoding rpoS from BJ4 on a 1.6-kb PCR fragment | This work |