These symptoms may be referable to virus infection rather than parasites.
这些症状也许是由病毒感染引起的，而与寄生虫无关。
The reason why the injection needs repeating every year is that the virus changes.
每年需要重新注射的原因是这病毒经常变化。
This virus infected thousands of computers across the U.S. and Europe within days.
这种病毒几天之内就使美国和欧洲成千上万台电脑中毒。
The locals were encouraged to trap and kill mice to stop the spread of the virus.
当地人被鼓励用捕捉器捕杀老鼠以阻止病毒的传播。
The test could be used to screen healthy people to see if they are carrying the virus.
这项测试可以用来检查健康人群，看他们是否携带该病毒。
It is very unnerving to find out that someone you see every day is carrying a potentially deadly virus.
发现你每天都见的人携带着可能致命的病毒让人不安。
The virus can actually destroy those white blood cells, leaving the body wide open to attack from other infections.
该病毒实际上能破坏那些白血球，使身体极易受到其他感染。
His estimate of half a million HIV-positive cases was based on an extrapolation of the known incidence of the virus.
他的50万HIV阳性病例的估计是基于对已知病毒发病率的推断。
In 1960 some polio vaccine was contaminated with the virus.
1960年，一些脊髓灰质炎疫苗被病毒污染。
Hepatitis is a virus that specifically affects the liver, so viruses are often specific to certain kinds of cells.
肝炎是一种专门感染肝脏的病毒，所以病毒通常都有细胞特异性。
A person who has chickenpox can spread the virus even before he or she has any symptoms.
水痘患者在出现任何症状之前都可以传播病毒。
Wild birds have caught the canary pox virus, and penguins have been stricken by avian malaria.
野生鸟类感染了金丝雀痘病毒，企鹅也感染了禽疟。
The stripes of the Semper Augustus were caused by the genes of a virus.
“永远的奥古斯都”上的条纹是由一种病毒基因造成的。
The virus is not killed so it's a live virus, which is actually going to infect your intestinal system and reproduce.
病毒没有被杀死，所以它是活病毒，它会感染你的肠道系统并繁殖。
The virus stays in you longer because your body doesn't develop a way to fight it and kill it.
你的身体没有产生抵抗与杀死病毒的办法，因此病毒在你体内存活的时间更长了。
Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease.
用于食用的牛和鸡经常被喂食会传播病毒的饲料，该病毒引起这种疾病。
In other cases, the virus propagates in such high numbers that release is literally an explosion of the cell.
在其他情况下，病毒以如此高的数量繁殖，以至于释放出的病毒简直就是细胞的爆炸。
In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface.
在病毒感染的反应中，老鼠的免疫系统通常会产生抗体，通过与病毒表面的蛋白质结合来破坏病毒。
As many as ten-million children will have been infected with the virus by the end of the decade.
多达1千万的儿童到这个时代末将已染上这种病毒。
This virus was highly infectious.
这种病毒传染性很强。
The virus was spreading to other trees.
病毒正传播到其他树木。
HINI virus could spread among people.
H1N1 病毒可以人传人。
Fresh air can stop the virus from building up.
新鲜空气可以阻止病毒积聚。
When the virus is going around, too many kisses are not good.
病毒传播时，亲吻太多是不好的。
The government took too strict measures to control the virus.
政府采取了非常严格的措施来控制病毒。
Keep distance in public places to avoid catching a virus.
在公共场所保持距离，以避免感染病毒。
Scientists have found that the virus probably came from bats.
科学家们发现，这种病毒可能来自蝙蝠。
People failed to realize the danger of the virus.
人们没有意识到这种病毒的危险性。
We can understand the virus basing on reason and science.
我们可以在理性和科学的基础上了解病毒。
We can understand the virus basing on reason and science.
我们可以在理性和科学的基础上了解病毒。
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