Often a vaccine is most likely to be effective when delivered this way and protection is of long duration (Mitchell, 1995). There are, however, a number of limitationsto this method. Not only is the process of handling, anesthetizing
đang được dịch, vui lòng đợi..
![](//viimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)