鸡传染性法氏囊病B_（－2），D_（78），TAD弱毒苗对青海流行野毒的效力试

An Effect Test Using Infectious Bursal Disease Attenuated Vaccine B_(-2),D_(78) and TAD to Prevent Epidemic Virus Strain in Qinghai

对鸡传染性法氏囊病弱毒苗Ｂｕｒｓｉｎｅ－２，Ｄ_（７８），ＴＡＤ进行复制，免疫２１日龄雏鸡，１４天后ＡＧＤ抗体阳性率达９０％～１００％，用从本地分离的Ｓ_（－９３０２）强毒１：１０囊乳剂０．２ｍｌ／只滴鼻、点眼、口服攻毒，结果对照组１００％发病，５０％死亡，试验组１００％保护，获得较好的免疫效果。

Infectious Bursal Disease (IBD)Attenuated Vaccine B_(-2),D_(78) and TAD were du-plicated and vaccinated in 21day old chick, after 14 days the positive rate of AGP antibodywas 90%～100%. In addition,A bursal emulsion(S_(-9302))produced by virulent virus was usedin vaccinated and non-vaccinated chicks. the bursal emulsion was dropped in eyes,nostril andper. os with a dosage of 0.2ml(10%)per chick. All of the non-vaccinated animals sufferedfrom IBD and half of them died,While no chicks in vaccinated group died.