| Category A disease | Minimum period of fallowing of the affected establishment | Minimum period of synchronised fallowing of affected establishments in the same protection zone | Supplementary requirements |
|---|
| Infection with Mikrocytos mackini | 6 months | 4 weeks | Must include the coldest period of the year |
| Infection with Perkinsus marinus | 6 months | 4 weeks | Must include the warmest period of the year |
| Infection with Taura syndrome virus | 6 weeks | 4 weeks | Must include the warmest period of the year |
| Infection with Yellow head syndrome virus | 6 weeks | 3 weeks | Must include the warmest period of the year |
| Epizootic haematopoietic necrosis | 8 weeks | 4 weeks | Must include the warmest period of the year |
