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new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.
这种疫苗是根据最常见的轮状病毒毒株制成的，而且在两年的时间里也能很好地保护人体不受其它一些毒株的感染。
The vaccine is derived from the most commonly circulating strain of rotavirus, and also offered good protection against some other strains across the two-year period.
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。
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.
流感病毒不断发生基因变化并需要符合正在传播的流感毒株的疫苗以便产生作用，所以每年必须调整季节性流感疫苗。
Influenza viruses constantly undergo genetic changes and require vaccines that match the circulating influenza strains to be effective, so seasonal influenza vaccines have to be modified annually.
几乎所有的传统流感疫苗都是通过在鸡胚中增殖病毒而获得德，这是一个缓慢的过程，某些毒株甚至更慢——包括2009年的H1N 1流感病毒。
Nearly all conventional flu vaccines are made by growing the virus in chicken eggs, a slow process that is even slower with some strains - including 2009 H1N1 flu.
验证疫苗株：制备好混合病毒后，必须进行验证以保证其确实能产生大流行毒株的外蛋白，并且是安全的，能在鸡蛋中生长。
Verification of the vaccine strain: After its preparation, the hybrid virus needs to be tested to make sure that it truly produces the outer proteins of the pandemic strain, is safe and grows in eggs.
之前与H1N1病毒有过接触史似乎是一个关键因素，可以让人识别出1976年的疫苗毒株并产生强烈的免疫应答，这就如同1976年的疫苗能让人对2009年H1N1病毒产生强烈免疫应答一样。
That prior encounter with H1N1 seemed to be the key to a robust recognition of the 1976 vaccine virus, just as having had the 1976 vaccine seems to produce a strong response to the 2009 H1N1 virus.
一旦鉴定并分离出具有大流行可能的流感病毒新毒株，大约需要5至6个月时间提供首批获批准的疫苗。
It takes approximately five to six months for the first supplies of approved vaccine to become available once a new strain of influenza virus with pandemic potential is identified and isolated.
应用组织学方法比较观察了猪繁殖与呼吸综合征病毒（PRRSV）弱毒细胞疫苗与灭活疫苗生殖道黏膜免疫的效果。
The effect of mucosal immune of porcine reproductive and respiratory syndrome virus (PRRSV) attenuated and disactived vaccine was investigated by histological method.
甲型肝炎病毒TZ84毒株经2BS二倍体细胞培养制备成甲型肝炎灭活疫苗。采用普通狨猴和恒河猴进行疫苗的保护性研究。
Inactivated hepatitis A(HA) vaccine was prepared by culturing the strain TZ84 of HA virus in 2BS cells, and the immunogencity of it was studied in common marmosets and Macaca mulattas.
科学家称，两种可以攻击HIV病毒多种毒株的薄弱环节的新抗体被发现，这一发现大大提高了艾滋病疫苗研制成功的希望。
Scientists say the two can attack a variety of strains of HIV, the weak link of the new antibody was found, the discovery of AIDS vaccine development has greatly enhanced the success of hope.
序列分析显示，病毒分为野毒和疫苗毒两簇，野毒的分型和地理位置关系密切。
Sequence analysis showed that viruses were divided into two clusters of wild-type and vaccine virus, respectively, and the wild virus had close relationship with its geographic location.
序列分析显示，病毒分为野毒和疫苗毒两簇，野毒的分型和地理位置关系密切。
Sequence analysis showed that viruses were divided into two clusters of wild-type and vaccine virus, respectively, and the wild virus had close relationship with its geographic location.
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