如果目前的猪流感转为爆发性瘟疫全球三分之一的人,即二十亿人将被传染.这不是预言而是根据过去历史上爆发瘟疫的情况而作出的估算.
原文如下:

The World Health Organization said Thursday that up to 2 billion people could be infected by swine flu if the current outbreak turns into a pandemic. The agency said a pandemic typically lasts two years.

WHO flu chief Keiji Fukuda said the number wasn't a prediction, but that experience with flu pandemics showed one-third of the world's population gets infected.

"If we do move into a pandemic then our expectation is that we will see a large number of people infected worldwide," Fukuda said. "If you look at past pandemics, it would be a reasonable estimate to say perhaps a third of the world's population would get infected with this virus."