不久以前，人们还无法想象一种病毒能使众多国家封闭，而安全网被证明是如此灾难性地缺乏灵活性。
Not very long ago, it was also unthinkable that a virus would shut down nations and that safety nets would be proven so disastrously lacking in flexibility.
政府计划通过使用一种病毒来减少兔子的数量，这种病毒已经在其他地方的兔子种群中造成了毁灭性的流行病。
The government proposes to reduce the population by using a virus that has caused devastating epidemics in rabbit populations elsewhere.
研究员分别这两种病毒只用了两个小时。
麻疹由副粘病毒科的一种病毒引起。
嗯，它可能是一种病毒，有一些证据支持这种看法。
Well, it could be a virus.There is some evidence supporting that. But it could also be cow's milk.
血凝素是一种病毒蛋白，能帮助流感病毒侵入宿主细胞。
Hemagglutinin is a viral protein that enables the flu virus to enter host cells.
狂犬病是一种病毒病，通常是由被感染动物的咬伤传播的。
Rabies is a viral disease usually transmitted by a bite from an infected mammal.
这个发现出人意料，因为这两种病毒的DNA序列并不高度相似。
That protection is somewhat counterintuitive: on the basis of DNA sequence alone, the two viruses are not strikingly similar.
裂谷热病毒是沙蝇病毒属的一个成员，即布尼亚病毒科五种病毒之一。
RVF virus is a member of the Phlebovirus genus, one of the five genera in the family Bunyaviridae.
另一种途径是两种病毒同时感染人类密切接触的另一种动物，例如猪。
Another way would be for both types of virus to infect other animals with which humans have close contact, such as pigs.
他们用一种病毒来把这些基因引入老鼠胚胎的皮肤细胞，然后进行监测。
A virus was used to introduce the genes to mouse embryo skin cells, which were then monitored.
在人口超过60亿的世界中，要在全球根除一种病毒不是一件容易的事。
Global eradication of a virus in a world of more than 6 billion people is not an easy job.
答：登革热由一种受染于四种登革热病毒中任何一种病毒的伊蚊叮咬所传播。
A: dengue is transmitted by the bite of an Aedes mosquito infected with any one of the four dengue viruses.
他们发现，许多蚊子都吞食了蜂蜜，而且70%的卡片检测三种病毒都呈阳性。
They found that many mosquitoes had consumed the honey, and that more than 70% of CARDS tested positive for the three viruses.
四天以后，另一只不聋的耳朵也被一种腺病毒所感染(引起感冒的一种病毒)。
Then, after four days, their left ears were infected with an adenovirus (one of the sorts of virus that cause colds).
如今，科学家们发现拥有某一类型这种基因的人或许感染上一种病毒后才会引发克罗恩病。
Now scientists find that those with one type of risky gene may also need to catch a virus to trigger the disease.
对付这两种病毒也有可能有类似的解决方法，只要有人能够识别出他们的保守部分。
A similar approach to those two viruses is always possible if one can identify the conserved regions.
他设计一种病毒，也就是噬菌体，用来破坏生物膜，攻破细菌抵抗抗生素的防御体系。
He engineered a type of virus, known as a phage, to destroy biofilms and sabotage their defenses against antibiotics.
普通感冒是一种病毒感染性疾病，可由250种病毒引起，其中最常见的一类是鼻病毒。
The common cold is a viral infection that can be caused by any of up to 250 strains of virus, the most common group of which are the rhinoviruses that hit the nose.
马尔堡出血热是由来自与引起埃博拉出血热的病毒同一科的一种病毒引起的严重高致命性疾病。
Marburg haemorrhagic fever is a severe and highly fatal disease caused by a virus from the same family as the one that causes Ebola haemorrhagic fever.
在这里，称为噬菌体的使细菌感染的病毒，被设计成这样，即每一种病毒表面都涂了一层独特的随机的肽。
Here viruses that infect bacteria, called phage, are engineered such that each virus has on its surface coat a unique random peptide.
而那种蛋白质是病毒变化最快的部分，因此，针对一种病毒株的抗体可能识别不出另一种病毒株。
But that protein is the fastest-changing part of the virus, so antibodies to one strain might not recognize another.
裂谷热是一种病毒疾病，主要影响的是动物(如牛、水牛、绵羊、山羊和骆驼)，也可以影响人类。
RVF is a viral disease that primarily affects animals (such as cattle, buffalo, sheep, goats and camels). The disease can also affect humans.
但以后要是被另一种病毒变种感染，将增加导致登革出血热发生的风险，这在拉美变得越来越普遍了。
But subsequent infection by another variant increases the risk of developing DHF, which is becoming much more common in Latin America.
当科学家们研究感染黑猩猩的病毒菌株时，他们发现这是与首先感染人类的病毒所密切相关的一种病毒。
And when scientists looked at the strain infecting the chimps, they found that it was a close relative of the virus that first infected humans.
他们把这三组因子的基因搭载到一种病毒上，再用病毒感染被称作外分泌细胞的另一种类型的胰腺细胞。
They hitched the genes for these three factors onto a virus that infects another type of pancreatic cell, known as an exocrine cell.
感染一种病毒并恢复后，对该病毒具有终生免疫，但对此后感染的其他三种病毒只有部分和短暂免疫力。
Recovery from infection by one provides lifelong immunity against that virus but confers only partial and transient protection against subsequent infection by the other three viruses.
感染一种病毒并恢复后，对该病毒具有终生免疫，但对此后感染的其他三种病毒只有部分和短暂免疫力。
Recovery from infection by one provides lifelong immunity against that virus but confers only partial and transient protection against subsequent infection by the other three viruses.
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