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Grouping of DHV immunization test.
| Serial Number | Group | Immunizing Dose | Storage Time at 2–8 ℃ | Number of Ducks |
|---|---|---|---|---|
| 1 | Freeze-dried vaccines | 1.0 ml | 12months | 10 |
| 2 | Commercial vaccines | 1.0 mL | 12 months | 10 |
| 3 | No virus vaccines | 1.0 normal saline | 12 months | 10 |
