TABLE 4.
Mortality rates in malnourished C57BL/6 mice after oral infection with various strains of E. coli O157 used in this study
| Bacterial strain (serotype) | Mortality (%) at 10 days postinfectiona |
|---|---|
| EHEC | |
| N-9 (O157:H7) | 90 |
| N-5 (O157:H7) | 75 |
| N-10 (O157:H7) | 40 |
| N-20 (O157:H−) | 35 |
| OK-7 (O157:H7) | 65 |
| OK-12 (O157:H7) | 60 |
| Controls | |
| E. coli NP-4 (isolated from a healthy adult) | 0 |
| S. soerenga (O301) | 0 |
a
Groups of 10 mice with PCM were infected intragastrically with 2 × 106 CFU of Stx-producing E. coli or of nonpathogenic E. coli or S. soerenga. Each group consisted of 10 mice. Data were obtained from two separate experiments and are expressed as the mean of two results.