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General characteristics of the 39 farms affected by classical swine fever.
| Number of farms | |
|---|---|
| Structure of affected pig houses | |
| Windowless | 0 |
| Semi-windowlessa | 18 |
| With open windowsb | 21 |
| Feedstuff | |
| Commercial feed only | 33 |
| Other than commercial feed | 6 |
One of the 18 semi-windowless pig-houses had open-air paddocks.
Two of the 21 pig-houses with open windows had open-air paddocks.
