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The most common viral agent is Coxsackie B.

最常用的病毒是柯萨奇病毒B。

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VA , a anti viral agent from plants, could inactivate TMV in vitro , when it was mixed with TMV and inoculated by means of half leaf. The inhibition rate of necrotic local lesions was 80.0%.

用植物源抗病毒制剂VA与烟草花叶病毒（TMV）混合，经枯斑半叶法接种，结果证明，VA对TMV有较强的体外钝化作用，体外钝化后的枯斑抑制率为80 .0 % ；

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They're going to release a viral agent that will kill half of this country.

他们会释放出一种病毒，让这个国家一半的人丧命。

There is 实战 - SpeakingMax英语口语达人

Only last year, the English Football Association (FA) delayed the launch of a viral video tackling the issue of homophobia in the game when it emerged that every footballer and agent the FA approached had declined to endorse it.

CNN: Soccer's last taboo: Why gay players stay in the closet