immunology

Smallpox kills billions of people and how medicine defeats them!
10,000 years ago, a deadly virus 'hit' in northeastern Africa, they spread through the air, attacking the victims' skin, bone marrow, spleen and lymph nodes.
The experiment on an 8-year-old boy was the source of the invention of the vaccine
The vaccine, since its discovery and use, has protected us from horrible diseases, seemingly impossible to cure, so this is one of the greatest discoveries of humanity.