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Epidemic size versus numbers of markets infected. (Means of 1600 index cases, one per simulation, through sheep movements only, at the 2004 peak in sheep activity; s.e. shown in parentheses.)
| markets infected | 0 | 1 | 2 | 4 | 8 |
| mean epidemic size | 0.4 (0.04) | 3.8 (0.18) | 9.4 (0.55) | 32.0 (2.7) | 61.1 (4.9) |
