The ducklings of MDRD group were inoculated for 0.2ml 100LD50 muscovy duck reovirus (MDRV), respectively, and the birds of control group were treated with the saline at the same time.

• 对3日龄雏番鸭肌肉注射番鸭呼肠孤病毒液0.；2mL/只（含100LD50/ mL病毒量），同时设肌肉注射0