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Table 1 Proportion of primary outbreak farms spreading infection to a given number of farms during the first generation of an epidemic (averaged over the period from 1 January 2003 to 31 July 2007) for a disease transmitted by any livestock depending on the length of the infectious period on the primary outbreak farm.

From: Potential for epidemic take-off from the primary outbreak farm via livestock movements

No. of farms in first generation Proportion of primary outbreak farms causing spread for a given infectious period
  1 week 2 weeks 4 weeks
1 0.0187 0.0478 0.0782
2 0.0054 0.0176 0.0335
3 0.0026 0.0085 0.0281
4 0.0017 0.0048 0.0124
> 4 0.0028 0.0105 0.0291