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C. difficile toxin titre required to achieve 90% CPE on Vero and HT-29 cells after 24 h incubation at 37 °C with 5% CO2.
| C. difficile strain | Modal toxin titre (range) | |
|---|---|---|
| Vero cells | HT-29 cells | |
| NCTC 13366 | 1:524,288 (1:524,288 – 1:2,097152) | 1:262,144 (131,072-524,288) |
| R11446 | 1:8,192 (1:2,048 – 1:8,192) | 1:8,192 (4,096-8,16,384) |
| ATCC 43598 | 1:512 (1:512 – 1:1,024) | 1:8 (1:8-1:32) |
