I am afraid you are misinformed about polio, yellow fever and chicken pox vaccines my good friend.
The only things that will help bring the first two under control is changes in sanitation and hygiene.
A group of medical doctors in India have taken out full page advertisements in the major newspapers begging the foundations to immediately cease the polio vaccine programs, as they are doing tremendous amounts of harm.

Chicken pox, is an almost harmless disease in healthy children, and we are starting to understand that having passed through it allows the proper development of the immune system, and along with normal exposures throughout life, provides 100% effective protection against both chicken pox and shingles.
Shingles is a disease, that unlike Chicken Pox, regularly maims and kills.
(of course a vaccine against shingles has now been developed)

Now, for the costs of the interventions favoured by the large supposedly humanitarian foundations, real change could be made to communities throughout the third world, in sanitation and clean water and food, resulting in permanent improvements in life expectancy and infant mortality.