Part 1: How vaccines are made and how they work
In 2008, WHO estimated that 1.5 million of deaths among children under 5 years were due to diseases that could have been prevented by routine vaccination. This represents 17% of global total mortality in children under 5 years of age.
Hygiene, proper nourishment and sanitary conditions make for a healthy community, with lowered incidence of infectious disease, but since much of this is lacking in developing countries, vaccination is very helpful to giving the immune system a boost.
We can thank scientists, physicians and engineers for their work in understanding the immune system and how to make it work for us against disease by using vaccinations.