Khali's Timeline By 1515140 541 BCE Small Pox Outbreak Caused by Yersinia Pestis and killed 13% of the world's population. 430 BCE Small Pox Outbreak Kills 20% of Ancient Athens Jan 5, 1918 The Great Flu Pandemic 30 - 50 million people worldwide Jan 5, 1973 Yellow Fever Killed 4500 people. Jan 5, 1984 HIVs/AIDs 25 million people have died since the first case was reported