How many swine flu viruses are there?
现在有多少种猪流感病毒？
Swine flu viruses that cause disease in pigs very rarely affect humans.
通常情况下，人类很少感染猪流感病毒。
Swine flu viruses do not normally infect humans. However, sporadic human infections with swine flu have occurred.
一般来说猪流感并不会感染人类，但人们已经发现了少数人类感染猪流感的病例。
H1N1 and H3N2 swine flu viruses are endemic among pig populations in the United States and something that the industry deals with routinely.
H1N1和H3N 2猪流感病毒在美国是地区性发作的，这也是养猪业经常要面对的问题。
Swine flu viruses have been reported to spread from person-to-person, but in the past, this transmission was limited and not sustained beyond three people.
已报道猪流感病毒能在人间传播，但在过去，这传播是有限的并且不能连续超过3人。
Swine flu viruses are thought to be spread mostly through close contact among pigs and possibly from contaminated objects moving between infected and uninfected pigs.
猪流感病毒被认为通过猪之间的近距离接触进行传播，另一种可能的传播方式是携带病毒的物体将病毒从被感染的猪群传播到健康的猪群中。
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。
This year’s seasonal vaccine contains three influenza viruses — one A (H3N2) virus, one regular seasonal A (H1N1) virus unrelated to the swine flu strain and one B virus.
今年的季节流感疫苗含有三种流感病毒——一种甲型（H3N2）病毒，一种与猪流感毒株无关的常规季节性甲型（H1N1）病毒，以及一种乙型病毒。
Human infections with swine flu H1N1 viruses are rare.
人类感染H1N 1猪流感病毒的病例很少见。
Is the H1N1 swine flu virus the same as human H1N1 viruses?
H 1 N 1猪流感病毒与H1N1人流感病毒是一样的吗？
The swine flu virus is a biological organism, a unique remix of genes from older influenza viruses.
而猪流感病毒则是生物机体，它是一种由古老的流感病毒混合而成的特别的新病毒。
There is no vaccine to protect humans from swine flu. The seasonal influenza vaccine will likely help provide partial protection against swine H3N2, but not swine H1N1 viruses.
对人来说，季节性流感疫苗很可能只能提供部分的保护免受H3N2猪流感病毒，但对于H1N1猪流感病毒，该疫苗没有保护作用。
They used 65 respiratory specimens collected during April and May that had previously tested positive either for swine flu or one of the seasonal flu viruses.
他们应用在4月和5月收集的预先对猪流感或是季节流感病毒之一测试呈阳性的65个呼吸系样本。
The new flu strain — a mixture of swine, human and avian flu viruses has killed more than 60 people among around 1,000 suspected cases in Mexico and infected less than 10 in the United States.
新的传染病病菌是一种猪，人及鸟流感病毒的混合体，在墨西哥1000多疑似病例中，已死亡60多人，在美国被传染人数大约10人。
The current swine flu H3N2 viruses are closely related to human H3N2 viruses.
H3N2病毒一开始是从人身上传染到猪的，现在的H3N2猪流感病毒与H3N2人流感病毒有着很近的相关性。
Viruses like those that carry swine flu seem terrifying, for instance, because we can't see or feel them and we have little control over our exposure to them.
比如，病毒携带猪流感让人恐惧，因为我们不能看到或感觉到它们，并且对它们的接触难以控制。
The swine flu pandemic that emerged in Mexico last March also resulted from the mixing of viruses that infected pigs, birds and humans to create a new pandemic strain.
去年三月在墨西哥出现的猪流感，也是混合病毒感染了猪、鸟和人类之后，产生的新流行病毒。
For months, it has been apparent that swine flu strikes the young more often than the old - an unusual pattern that suggests older patients could have been exposed to similar viruses in the past.
几个月以来，年轻人感染猪流感病毒的病例要多于老年人，这个不寻常的情况说明老年人很可能在过去感染过这种病毒。
Because not all older people would have caught viruses related to swine flu in the past, and because older people tend to have weaker immune systems.
因为并不是所有的老年人都感染过与过去的流感相关的病毒，他们并没有活动免疫。而且老年人的免疫系统普遍偏差。
That will be the case, even though that vaccine will be useless if swine flu behaves like previous pandemics and replaces the current, ordinary flu viruses.
情况就是这样，尽管如果猪流感表现像以前的大流行一样而取代目前的普通流感病毒，这些疫苗将会毫无用处。
Any new flu carries the risk of gene-swapping that can form mutant viruses, and this one has some swine and avian genes that, before this April, had never been seen in humans.
任何新流感都有基因转换从而产生变异病毒的危险，而这次的病毒包含有部分猪流感和禽流感的基因，在今年4月之前从未在人身上发现过。
Woods agrees that moderate exercise should be viewed as an adjunct to other preventive measures against respiratory viruses, including the H1N1 virus that causes swine flu.
老虎伍兹同意，适度的运动应作为其他预防措施的辅助方式来应对包括H1N1病毒的呼吸道病毒。这个病毒就是导致猪流感的病毒。
Swine flu is a group of influenza viruses that causes flu in pigs. Usually infections in humans is uncommon.
猪流感是引起猪出现流感的病毒性流感的一种。通常情况不传染给人。
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。
Swine flu is a respiratory disease of pigs caused by influenza viruses that causes regular outbreaks in pigs.
猪流感是一种发生在猪身上的呼吸道传染病，由流感病毒引起，经常在猪群中爆发。
Swine flu is a respiratory disease of pigs caused by influenza viruses that causes regular outbreaks in pigs.
猪流感是一种发生在猪身上的呼吸道传染病，由流感病毒引起，经常在猪群中爆发。
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