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Contingency table
| Intervention (four weeks before infection) | Development of clinical disease until 314 dpi | Number of animals tested | |
| Yes | No | ||
| Sham operation | 6 | 1 | 7 |
| Lymphadenectomy | 1 | 6 | 7 |
Table of contingency indicating the development of clinical disease in animals which underwent ipsilateral lymphadenectomy or sham operation four weeks before footpad infection with 0.001% scrapie-inoculum.
