Dr. Lucky Tran 
Between 1900 and 1950 malaria killed ~100 million people globally. The CDC was founded in 1946 to combat malaria, and that's why it's based in Atlanta. By 1951, malaria was eliminated from the United States. We need that same ambition from our public health agencies today. https://www.cdc.gov/malaria/about/history/history_cdc.html
Hiker-Pete@luckytran On a related note: Read “The Demon in the Freezer” by Richard Preston. It is a bit frightening, but it also covers some of the science of immunology and the efforts to eradicate Smallpox.