| How
Crisis Escalated |
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| • | February
20 |
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| – | First
case reported at an abattoir at |
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| Orchard
farm, Essex, with more at two |
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| nearby
farms in next two days. |
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| • | February
23 |
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| – | Fourth
case confirmed at a pig farm in |
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| Heddon-on-the-Wall,
Northumberland, now |
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| thought
to be the root of the epidemic. |
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| 33%
to 55% more cases as a result!* |
| *Mark
Woolhouse, Edinburgh |