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.

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。

youdao

Squalene is being added to improve the efficacy of several experimental vaccines including pandemic flu and malaria vaccines which are being developed.

几种正处于开发阶段的实验性疫苗(包括大流行性流感疫苗和疟疾疫苗)也添加了角鲨烯，用于增强疫苗效力。

youdao

It was Webster who discovered that birds were likely responsible for past flu pandemics, including the one in Asia in 1957 that killed about two million people.

也是韦伯斯特发现鸟类导致了流感疫情的蔓延。这包括亚洲1957年亚洲爆发的导致2千万人死亡的流感。

youdao

The hope is to develop a vaccine that could give lifelong protection against a majority of flu viruses, including bird flu.

VOA: special.2009.03.04

In the meantime, the Obama administration is urging common-sense steps to prevent the spread of swine flu, including frequent hand-washing and asking flu sufferers to stay at home.

VOA: standard.2009.05.03

She did not have an infection during her pregnancy, as her doctors had prepared for, but she faced minor complications including the flu, some bleeding and physical discomfort from her growing baby.

NPR: 5-Organ Transplant Patient Gives Birth: Baby Girl

Vaccines were also dogged by safety issues, including the swine flu vaccine fiasco of 1976, and by the dubious theory of a link between autism and the mercury once used in a vaccine preservative.

FORBES: Magazine Article

Past experiments have shown it to make viruses -- including the H5N1 bird flu virus -- more likely to infect ferrets, which are commonly used in flu research.

CNN: New bird flu well-adapted to infect people