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.
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。