This is particularly true for babies whose mothers are infected with HIV, even when the virus is not passed from mother to child.
尤其是那些母亲感染了HIV病毒的婴儿们，甚至在病毒还没有从母亲传给孩子的时候，这就再正确不过了。
That is also true in a rarer form of human AIDS caused by a virus called HIV-2.
这也真实地反映在另一种罕见的人类艾滋病上，这种艾滋病是由HIV - 2型病毒而引发的。
That led to hopes that the H5N1 virus simply lacked the ability to be a true pandemic killer and that to become more transmissible, it would necessarily have to become less dangerous.
从而我们可以简单地认为H5N1病毒缺乏成为大流行流感的能力，而H5N1要具有更强的传染性，它的致病性就不得不减弱。
New diseases are, by definition, poorly understood when they emerge, and this is most especially true when the causative agent is an influenza virus.
从定义上讲，人们对新出现的疾病了解很少，从病原体是流感这一点上可以看到这一点。
With true multiple site systems, and taking into account the very young weaning ages achieved in the USA, elimination of PRRS virus has been reported.
在美国，真正的多场系统中已有根除PRRS的报道，这也部分归功于美国所达到的非常小的早期断奶日龄有关。
With true multiple site systems, and taking into account the very young weaning ages achieved in the USA, elimination of PRRS virus has been reported.
在美国，真正的多场系统中已有根除PRRS的报道，这也部分归功于美国所达到的非常小的早期断奶日龄有关。
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