translation.en: The sad reality is, we develop vaccines not based upon the risk the pathogen poses to people, but on how economically risky it is to develop these vaccines.
translation.zh: 现实的可悲之处在于， 我们研制一种疫苗， 并非是考虑病原体对人类的风险有多大， 而是考虑研制疫苗的经济风险有多大。