There are three types of seasonal influenza – A, B and C. Type A influenza viruses are further typed into subtypes according to different kinds and combinations of virus surface proteins.
有三种类型的季节性流感——甲型、乙型和丙型。根据病毒表面蛋白不同的种类和结合情况，甲型流感病毒又进一步分类为亚型。
It is a contagious respiratory disease of pigs caused by type a influenza viruses. Pigs are hit by regular outbreaks.
猪流感是由A型流感病毒引起的猪呼吸道传染病，病毒的定期爆发会引起猪患病。
Shell viruses wrap themselves around a host program and don't modify the original program．Shell programs are easy to write，which is why about half of viruses are of this type．
外壳型病毒将它们自己包裹在主程序的四周，对源程序不作修改。 外壳型病毒容易编写，这也正是约有一半病毒程序是这种类型的原因。
Since April 2008, cases due to type 1 polio genetically linked to viruses from northern Nigeria have been detected in Benin, Burkina Faso, Ghana, Niger, Mali and Togo.
2008年4月以来，在贝宁、布基纳法索、加纳、尼日尔、马里和多哥发现了与尼日利亚北部病毒有基因关联的1型脊髓灰质炎病例。
The findings help lay the groundwork for a new type of cancer medicine using cancer-killing viruses.
这一发现为使用抗癌病毒的新型抗癌药物奠定了基础。
Viruses are engineered to infect neurons with a special type of channel, originally discovered in algae, which is sensitive to blue light.
最初在海藻中发现的病毒通过一种特殊的通道侵害神经细胞，这种病毒对蓝光较敏感。
This payload deletes various files on the hard disk. The number and type of files that might be deleted vary among viruses.
这个有效载荷删除在硬盘上的各种文件。可能会被删除文件的数目和类型在病毒之中改变。
The first of these produces molecules called Type 1 interferons, whose role is to fight off viruses.
第一组基因能制造出被称为1型干扰素的分子，其作用是抵抗病毒。
Swine flu is a respiratory disease of pigs caused by type a flu viruses, the CDC's Web site says.
CDC的官方网站称，猪流感是由猪a型流感病毒所致的猪呼吸道疾病。
Sometimes pigs can be infected with more than one virus type at a time, which can allow the genes from these viruses to mix.
有时猪可同时感染一种以上类型的病毒，从而可以使这些病毒的基因混合。
The scientists also studied two bird flu viruses, H5N1 (belonging to the type 1 branch) and H7N9 (type 2), each of which already has caused hundreds of cases of severe illness or death in humans.
科学家们对H5N1型（属于1型分支）和H7N9型（2型）禽流感病毒进行了研究，目前已有数百人因此患重病或死亡。
The age effect is seen because influenza a viruses - the kind considered most likely to cause pandemics - have evolved into two major branches known as type 1 and type 2 flus.
年龄效应可见于甲型流感病毒中。这是一种最可能广泛传播的流感病毒，已经演变出甲1型流感病毒、甲2型流感病毒两个主要分支。
Thee age effect is seen because influenza a viruses - the kind considered most likely to cause pandemics - have evolved into two major branches known as type 1 and type 2 flus.
年龄效应可见于甲型流感病毒中。这是一种最可能广泛传播的流感病毒，已经演变出甲1型流感病毒、甲2型流感病毒两个主要分支。
Surprisingly, viruses appear to be good models for understanding this type of cellular decision-making.
令人惊讶的是，病毒是理解细胞决定形成的理想模型。
Influenza viruses induce apoptosis through mechanisms involving the interplay of cellular and viral factors that may depend on the cell type.
流感病毒诱导的细胞凋亡，涉及到各方面的问题，包括细胞和病毒因子的相互关系、细胞种类等因素。
Objective To generate rescued viruses with deletion mutation of capsid protein from dengue virus type 2 isolated in China (DEN2-43).
目的制备登革2型病毒中国分离株(DEN2 - 43)的衣壳蛋白缺失突变病毒。
The drug works by targeting a type of RNA produced only in cells that have been infected by viruses.
这种药物通过面向那些仅仅被病毒感染的细胞才能合成的一种RNA来起作用。
Over the years, different variations of swine flu viruses have emerged. At this time, there are four main influenza type A virus subtypes that have been isolated in pigs: H1N1, H1N2, H3N2, and H3N1.
随着时间的推移，也出现了猪流感病毒的多种变种：现在人们从猪身上分离出了4种主要的A型流感病毒亚型：H1N1，H1N2，H3N2，H3N1。
Sequence analysis showed that viruses were divided into two clusters of wild-type and vaccine virus, respectively, and the wild virus had close relationship with its geographic location.
序列分析显示，病毒分为野毒和疫苗毒两簇，野毒的分型和地理位置关系密切。
Sequence analysis showed that viruses were divided into two clusters of wild-type and vaccine virus, respectively, and the wild virus had close relationship with its geographic location.
序列分析显示，病毒分为野毒和疫苗毒两簇，野毒的分型和地理位置关系密切。
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