| Organism | Serotype | No. of strains tested |
| E. coli | 2006 spinach O157:H7 outbreak isolates | 186 |
| 2006 Taco Bell O157:H7 isolates | 58 | |
| 2006 Taco John O157:H7 isolates | 11 | |
| DMB strain collections from other O157:H7 outbreaks | 112 | |
| O104:H4 | 3 | |
| O26 | 18 | |
| O103 | 13 | |
| O111 | 24 | |
| O121 | 2 | |
| O45 | 5 | |
| O145 | 9 | |
| O113 | 2 | |
| O91 | 1 | |
| O55 | 9 | |
| Other | 19 | |
| Salmonella | Typhi | 1 |
| Newport | 2 | |
| Shigella dysenteriae | 6 | 2 |
| Shigella sonnei | Unknown | 2 |
| Shigella flexneri | 4 | 1 |
| Shigella boydii | 1 | 1 |
| Total | 481 |
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