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new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.
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2. 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.
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3. 这一特定H1N 1毒株以前未曾有过人间传播。
This particular H1N1 strain has not circulated previously in humans.
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4. 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.
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5. 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.
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6. 这个毒株内少量遗传差异的含义也并不清楚。
The implications of the slight genetic differences in this strain are also not known.
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7. 所涉及的具体毒株为H5N1、H7N7和H7N3。
Specific strains implicated are H5N1, H7N7, and H7N3.
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8. 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.
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9. 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.
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10. 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.
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11. 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.
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12. 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.
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13. 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.
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14. 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.
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15. 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.
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16. 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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17. 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.
