有许多不同类型的流感病毒。
它是一个重要的全球卫生问题，也是最严重类型的病毒性肝炎。
It is a major global health problem and the most serious type of viral hepatitis.
原因在于，流感病毒的变异比其它类型病毒的变异快得多。
The reason is that the influenza virus mutates much more rapidly than most other viruses.
有四种类型的病毒：外壳、入侵、操作系统和源码。
There are four main types of viruses: shell, intrusive, operating system, and source code.
有四种类型的病毒程序：外壳型、入侵型、搡作系统型和源码型。
There are four main types of viruses: shell, intrusive, operating system and source code.
有两种类型的病毒，导致冷疮。
艾滋病毒是一种特殊类型的病毒被称为一反转录病毒。
能引起疱疹的病毒类型本身是乎没有保护作用。
The type that causes herpes itself does not seem to have a protective effect.
这种类型的新病毒于三月中旬在墨西哥发现。
目前至少有9种艾滋病病毒亚型，还有这多少种亚型的重组类型。
There are at least nine HIV subtypes in total, and several recombinants of these.
目前至少有9种艾滋病病毒亚型，还有这多少种亚型的重组类型。
There are at least nine HIV subtypes in total, and several recombinants of these.
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