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new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.
该病毒是否会产生变异，成为毒性更强的病毒株，仍有等观察。
It remains to be seen whether the virus will mutate into a more virulent strain.
一般在同一时候都有好多种不同的流感病毒株在活跃，而且这些病毒株在不断变异。
There are usually several different strains of influenza active at any time, and these variations evolve.
挪威公共卫生研究所向世卫组织通报说，在三株h1n 1病毒中检测出一株变异病毒。
The Norwegian Institute of Public Health has informed WHO of a mutation detected in three H1N1 viruses.
而且这病毒株随时可能变异成更大毒力型。
And the strain could change at any moment into a more serious form.
季节性流感的变异较缓和，被称为渐变；当像H1N1这样的新型病毒株发生变异的时候，这就是突变了。
When the mutations are gradual, as with seasonal flu, it is known as drift; when they are abrupt, as with the new strain of H1N1, you have a shift on your hands.
2009大流行病毒是1998流感的变异株，性能相同。
The 2009 pandemic virus is a variant on this 1998 flu, and behaves the same way.
答：疫苗衍生脊髓灰质炎病毒(VDPV)是一种罕见的脊髓灰质炎病毒株，由口服脊髓灰质炎疫苗(opv)里的病毒株遗传变异而来。
A: a vaccine-derived poliovirus (VDPV) is a rare strain of poliovirus, genetically mutated from the strain contained in oral polio vaccine (OPV).
目前造成家禽、野禽、人类及其他动物死亡的禽流感病毒通常是H5N1的变异株。
The strain currently causing most concern is H5N1, which has become a 'highly pathogenic' virus that is capable of killing domestic poultry, wild birds, and humans and other mammals.
2009年11月20日 |日内瓦-挪威公共卫生研究所向世卫组织通报说，在三株H1N1病毒中检测出一株变异病毒。
November 2009 | GENEVA - The Norwegian Institute of Public Health has informed WHO of a mutation detected in three H1N1 viruses.
目的了解北京地区流行性腮腺炎病毒流行株基因型分布和变异情况。
Objective To understand geographic distribution of mumps virus genotypes and variation of circulating mumps virus strains in Beijing.
方法：按who规定的原理和方法进行：对流感流行株、抗原和基因变异以及血清抗体和病毒多病原实行监测。
Methods: According to the principle and methods of the WHO stipulation, the influenza epidemic strains, antigen, gene variation, serum antibody and virus multi-pathogen were monitored.
流感病毒在狗肾传代细胞(MDCK)生长良好，而在其变异株mdck - L细胞生长受阻。
Influenza virus growth well in MDCK cell, but a variant of MDCK cell line (MDCKL cells) greatly restricted the growth of influenza viruses.
结论：交替使用轮拉米夫定、干扰素的序贯方法，有助病人忍受长期治疗并免于出现病毒株变异。
CONCLUSION: Sequential approach of alternate rounds of lamivudine or interferon may help patients to tolerate a prolonged schedule of therapy and protect them from emergence of viral strains.
目的研究柯萨奇B组3型病毒（CVB3）中国分离株结构蛋白VP4、非结构蛋白3D基因序列及变异性。
Objective To investigate the sequence and variation of VP4 and 3D gene of a coxsackievirus B3 Chinese isolate(CVB3-Chi).
目的研究我国轮状病毒流行株nsp4基因的变异特点。
Objective To clarify the features of gene variation among epidemic strains of human rotavirus NSP4 in China.
目的了解流感流行和流感病毒毒株表面抗原性变异情况。
Objective To understand the situations of influenza epidemic as well as the aberrance of the surface proteins antigenicity of influenza virus.
联合变异株主要见于重度慢性乙型肝炎患者，与血清病毒含量无关。
The united mutations often occurred in patients with severe chronic hepatitis B, and been not related to the viral load.
目的研究中国艾滋病病毒1型（HIV-1）毒株V3环序列的变异性。
Objective To study sequence variation of V3 loop of HIV-1 strains prevalent in China.
人巨细胞病毒UL131A，UL130，UL128基因在先天感染患儿临床株中的变异。
Genetic Variability of Human Cytomegalovirus UL131A, UL130, UL128 Genes in Strains from Congenitally Infected Infants.
当前狂犬病毒流行株与人用、兽用狂犬病疫苗株在基因和蛋白质水平出现的多处变异可能会导致流行株毒力的增强以及疫苗对它们的保护效果降低。
The Chinese isolates of rabies virus were diverged from the vaccines in both genes and deduced proteins. These divergences may result in the inefficiency of the vaccines.
直接测序显示每例患者主要的病毒株基因变异缺失都能干扰病毒复制和基因表达。
Direct sequencing showed the absence of mutations capable of interfering with viral replication and gene expression in the major viral population of each case.
然而，在研究了基因数据之后，病毒学家认为1918年的病毒一开始是一种纯的禽类病毒株，一些变异使得它可以轻易感染人类宿主。
After studying the genetic data, however, virologists concluded that the 1918 virus started out as a pure avian strain. A handful of mutations had enabled it to easily infect human hosts.
然而，在研究了基因数据之后，病毒学家认为1918年的病毒一开始是一种纯的禽类病毒株，一些变异使得它可以轻易感染人类宿主。
After studying the genetic data, however, virologists concluded that the 1918 virus started out as a pure avian strain. A handful of mutations had enabled it to easily infect human hosts.
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