人们接种疫苗抵抗猪流感比任何人挑战希望容易得多，根据目前情况，人们对现在席卷全球的大流行有意想不到的一定程度的免疫性。
VACCINATING people against swine flu may be a lot easier than anyone dared hope, as it turns out that people have an unexpected degree of immunity to the pandemic now sweeping the world.
世卫组织警告，如禽流感病毒变为可容易地在人之间传播的种类，这些暴发和其它暴发可演变为全球性流感大流行。
WHO warns that these and other outbreaks could evolve into a global influenza pandemic if the avian influenza virus changes into a form which could transmit easily between people.
如果H5N1型病毒发生变异，使其容易地在人间传播并得不到遏制，这就可能引发一场流感大流行。
If the H5N1 virus changes to allow it to pass easily from person to person, and it goes unchecked, this could trigger an influenza pandemic.
流感病毒尤其容易产生这种重组，一些流行病就是因为这种基因混合所产生的。
Flu viruses are especially prone to this and some pandemics have emerged because of this genetic mixing.
病毒通过适应上呼吸道系统，感染更多种细胞并且更加容易传播，并可能导致流感的大面积流行。
By adapting to the upper respiratory system, the virus is capable of infecting a wider range of cell types and is more easily spread, potentially setting the stage for a flu pandemic.
病毒通过适应上呼吸道系统，感染更多种细胞并且更加容易传播，并可能导致流感的大面积流行。
By adapting to the upper respiratory system, the virus is capable of infecting a wider range of cell types and is more easily spread, potentially setting the stage for a flu pandemic.
应用推荐