Moreover, where the private sector does play an essential role – vaccine development – it has little incentive to devote resources to diseases that afflict the poor or poor countries. It is only when advanced countries are threatened that there is sufficient impetus to invest in vaccines to confront diseases like Ebola.
此外，在私人部门确实起着关键作用的领域——疫苗研发，也找不到激励促使资源用于影响穷人或穷国的疾病。直到当发达国家受到威胁时，才有足够的动力投资于对抗埃博拉这样的疾病的疫苗。