The bivalent attenulated vaccines against DP andDYH have excellent immunigenty, which had been used with more than 10-milliondoaes in Tian Fu, Cherry Valley, SiCuan Ma, Jian Chang and Ao Bei Xing ducks fromthe years of 1990 to 1995.

• 经过1990－1995年大面积对天府肉鸭（曾祖代、祖代和父母代）、樱桃谷鸭（祖代和父母代）四川麻鸭、建昌鸭和奥日星鸭（祖代和父母代）共1千余万羽份的免疫注射，免疫效果良好，深受使用单位的欢迎。