As observed with the chickens, the filterable agent, a virus, could seldom be recovered from the malignant tumor which it had induced.

在鸡身上观察到，一种叫滤过性病原体的病毒，很少能从它诱发的恶性肿瘤中恢复过来。

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Sat-RNA of CMV is a subviral agent, which depends on its helper virus to replicate and cell to cell diffuse.

CMV 的 Sat-RNA 是一种亚病毒剂，取决于其辅助病毒的复制和细胞间的扩散。

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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。

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But unlike the Cowpox virus, vaccinea, that we talked about before, this is the real disease causing agent.

但是同我们之前曾讨论过的,牛痘病毒疫苗的不同之处在于,这是可以直接致病的病毒

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Some scientists think it's caused by an infectious agent, such as a virus.

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The Ebola virus is a highly infectious, often fatal agent spread through direct contact with bodily fluids.

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The deaths have stoked heightened fear of the virus, a highly infectious, often fatal agent spread through direct contact with bodily fluids.

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