Developing new vaccines is expensive, and if the target population is mostly in poor countries, there's nobody to foot the bill. That's why these diseases are c

Developing new vaccines is expensive, and if the target population is mostly in poor countries, there's nobody to foot the bill. That's why these diseases are called "neglected". https://en.wikipedia.org/wiki/Neglected_tropical_diseases#Economic_incentives https://en.wikipedia.org/wiki/Neglected_tropical_diseases#Ec...