几乎所有的传统流感疫苗都是通过在鸡胚中增殖病毒而获得德，这是一个缓慢的过程，某些毒株甚至更慢——包括2009年的H1N 1流感病毒。
Nearly all conventional flu vaccines are made by growing the virus in chicken eggs, a slow process that is even slower with some strains - including 2009 H1N1 flu.
多数是在鸡胚中生产的灭活病毒疫苗，一些是在细胞培养基中生产的灭活疫苗，还有几个减活病毒疫苗。
Most will be inactivated virus vaccines made in eggs, some will be killed virus vaccines made in cell cultures and a few will be live attenuated virus vaccines.
陈化兰指出，活疫苗的生产需要的鸡胚量远比传统减活疫苗少，使得大量生产和储存称为可能。
Production of the live vaccines requires much less chicken embryos than the traditional inactivated vaccines, which allows large-scale production and massive storage, Chen said.
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