A: The main cause of rapid population growth is when there are more births than there are deaths, which is referred to as a natural increase. Other causes of ... Full Answer >
Spanish flu (1918-1919). The influenza pandemic of 1918-1919 killed more people than the World War I, at somewhere between 20 and 40 million people. It has been cited as the most devastating epidemic in recorded world history. Known as Spanish Flu or La Grippe the influenza of 1918-1920 was a global disaster.
In Russia 68 civilians were killed in the 1979 Sverdlovsk incident when weapons grade anthrax accidentally leaked. Bioterrorism is also a possibility with a series of fatal postal attacks in carried out in the USA in 2001. 6. Cholera. Cholera is one of the most infectious diseases and is easily passed through contaminated food and water. Historically it has ripped through communities leaving half dead, even now it is estimated to kill 120,000 per year. In the past epidemics killed millions. Cholera kills through rapid dehydration.