We did it with smallpox, which has now been eradicated, and we are doing it with polio (with less than 100 cases worldwide this year). The challenge now is to do the same with all of our life-saving vaccines – particularly those that target the biggest killers of children.
所有这些都不意味着我们不再会面临重大障碍。但我们所知道的的关于免疫的一个要点是，我们可以让它普及到每一个人。被消灭的天花就是如此，小儿麻痹症也是如此（今年全球发病率不足100例）。当前的挑战是在我们的救命疫苗上依样画葫芦——特别是针对最大儿童杀手的疫苗。