You can't see this too well but there's a map of the world here that actually shows you all the individual cases of polio that occurred between this period of August 2007 and, it's cut off on the screen, February of 2008.

你可能看不清这个幻灯片,但是这里有一副世界地图,上面准确的展现了在二零零七年八月到,在屏幕上没有显示出来,是到二零零八年二月之间发生的,所有小儿麻痹症的个案

耶鲁公开课 - 生物医学工程探索课程节选