即使在感染你的时候，感冒病毒也会发生变异，而且新的病毒毒株经常出现，以至于当制药商研制出针对其中一种变异的疫苗时，血清已经过时了。
Colds mutate even while they're infecting you, and new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.
那就给毒株混杂与重组提供充足的机会。
That provides ample opportunity for strains to mingle and recombine.
H5N1是已知感染人类的H5亚型内唯一毒株。
H5N1 is the only strain within the H5 subtype known to infect humans.
H5N1是H5亚型中已知引起人间感染的唯一毒株。
H5N1 is the only strain within the H5 subtype known to cause human infections.
所涉及的具体毒株为H5N1、H7N7和H7N3。
H1N1病毒与过去的某些流感毒株相比生长更为高效。
The H1N1 virus itself grows more efficiently than some past flu strains.
在这方面，将该病毒与来自以往暴发的毒株进行比较可能是有益的。
In this regard, comparisons of the virus with strains from previous outbreaks may be instructive.
当时，H1N1病毒新毒株既不在视野之内，也未在该文件中提及。
The new H1N1 virus was neither on the horizon at that time nor mentioned in the document.
此外，低致病性H9N 2毒株(亚洲系)也引发了人间少数轻微呼吸道疾病病例。
In addition, the low-pathogenic H9N2 strain (Asian lineage) has caused a few human cases of mild respiratory illness.
为了便于人们对天花病毒的工作，我对它排序，按不同毒株并制备克隆片段。
We sequenced it and made different strains and prepared clone segments so people could work on it.
研究人员坚信通过给人体接种正确的抗体，能够终生免受大部分甚至全部流感毒株的感染。
By arming the human body with the right kinds of antibodies researchers believe they could provide lifelong protection from most influenza strains, and perhaps even all of them.
相反，病毒与在中国南方最近分离出的毒株相似，这表明病毒是从中国传播到泰国和老挝的。
Instead, the virus is similar to recent isolates from southern China, suggesting that the virus spread from China to Thailand and Laos.
经过一段时间，形成一种混合物，它包含实验室毒株的内部成分以及大流行毒株的外部成分。
After a while, a hybrid is formed which contains the inner components of the laboratory strain, and the outer components of the pandemic strain.
他们一般在二月份就预测好六月会有哪种毒株传播，以便医药公司未雨绸缪，准备好特效疫苗。
In February, they predict which strains of virus will circulate in the fall, and drug companies prepare vaccines to produce immunity to those specific strains.
他们一般在二月份就预测好六月会有哪种毒株传播，以便医药公司未雨绸缪，准备好特效疫苗。
In February, they predict which strains of virus will circulate in the fall, and drug companies prepare vaccines to produce immunity to those specific strains.
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