求翻译：以前没有出现过鸭源鸡杆菌这种病，也没有听说过，但现在知道有鸭源鸡杆菌的疫苗了，并包含3种主要菌株，接种菌株后鸡群体内会产生抗体，抗病毒能力增强，会对鸡群免疫力起到很好的保护作用是什么意思？

No duck source chicken bacillus disease, have not heard of, but now know from ducks chicken Bacillus vaccine contains three main strains, inoculated chickens body will produce antibodies, anti-virus capabilities enhancements would flock immunity play a very good protection

There have been no previous duck source chicken bacillus, which has not heard it before, but now I know that there is a duck and chicken sources of Haemophilus influenzae type b vaccine, and contains 3 main strains after vaccination strains within a group will be chicken antibody, anti-viral capabil

Before has not appeared duck source chicken bacillus this kind of sickness, also has not heard, but the present knew had the duck source chicken bacillus vaccine, and contained 3 kind of main strains, after the vaccination strain in the chicken community can produce the immune body, anti-viral abili

Lactobacillus chicken duck source this illness did not take place before, nor heard of, but now know of duck-derived Bacillus vaccine in chickens, and contains 3 major strains of chicken will produce antibodies after vaccination strains, antiviral capacity enhancement, protective effects on chicken

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