avirulent vaccine 中文意思是什麼
avirulent vaccine
解釋
無毒疫苗-
In recent years, the outbreak of nd appear some new characters, it is reported that the amount of immunity defeat on nd increased, even chicks with high hi titer can be infected by ndv virulent strain. the gene - engineering vaccine is badly needed to control nd outbreak. so newcastle disease virus strain b95, a naturally avirulent and heat stable strain, was introduced from australia
新城疫是國際獸疫局公布的16種烈性傳染病之一。近年來，新城疫的爆發出現了許多新特點，免疫失敗報道增多，甚至抗體水平較高的雞群也發病。為控制新城疫的爆發，急需研製基因工程苗。
分享友人