这些药物抑制一种叫做神经氨酸酐酶的酶，这种酶可以促使新生成的病毒离开被感染的细胞向周身散播。
These drugs act against an enzyme called neuraminidase, which allows newly formed viruses to leave infected cells and spread around the body.
专家们认为这样的作用并不理想，因为存在已免疫的鸡携带与散播病毒的风险，虽然它们看上去很健康。
However, experts are divided over its usefulness, because there is the risk that vaccinated chickens might still harbour and shed the virus, while appearing to be healthy.
病毒可从这里经苍蝇散播他处。
这两种全身的病毒能够通过许多不同的途径对机体造成损伤，包括随着血流散播并损伤全身的组织。
These systemic viruses can harm the body in a variety of ways, including traveling through the bloodstream and damaging tissues throughout the body.
将一个病毒的散播部分与另一个的破坏部分结合。
因为犬瘟还影响野生动物，野外犬科动物和家犬之间的接触会加大病毒的散播。
Because canine distemper also affects wildlife populations, contact between wild and domestic canids may facilitate spread of the virus.
H5N1禽流感病毒已在亚洲，或非洲、欧洲的家禽内散播。
The H5N1 avian flu virus has swept through flocks of poultry in Asia and sometimes in Africa and Europe.
但是他们能散播病毒几个星期。
病毒首先在墨西哥，北美洲和西欧登陆，然后逐渐散播到五大洲其它国家。
The virus landed on Mexico, North America and Western Europe in the first couple of weeks, followed by other countries in all continents.
到今年底，人类的H5N1病毒能力还不足以散播，警示层级只到第三阶段，距离真正的全球大流行（第六阶段）还差两步。
The self-limiting outbreaks of human H5N1 influenza seen so far bumped the alert level up to phase three, two steps removed from outright pandemic (phase six).
到今年底，人类的H5N1病毒能力还不足以散播，警示层级只到第三阶段，距离真正的全球大流行（第六阶段）还差两步。
The self-limiting outbreaks of human H5N1 influenza seen so far bumped the alert level up to phase three, two steps removed from outright pandemic (phase six).
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