Diseases have been around the world for hundreds of centuries - from when the Europeans came to new land and gave diseases, to the Native Americans, to currently in Africa where many children are dying from preventable diseases. Most diseases start from bacteria and viruses. But when someone says that they got a flu from someone, where did it start at and who did it start at? The two major reasons why people get diseases is from a chain of people or bacteria in the air. Both of these ways have other myths or religions debating on who is right or wrong. For an example, the Chinese pathology believes that different weather reactions cause different diseases, and in a way this is very true. If this is true then where do diseases come from? The answer to this question is very simple: diseases come from all kinds of bacteria and genetic irregularly that grows in different weather temperatures. Bacteria is a very powerful substance that scientists have been studying for over 1,000,000,000 years. If a bacteria starts growing in your body and it was exposed to wind, the disease or illness it could lead to is chills, colds, or a high fever. Although there is many other myths and pathology that tells their way of thinking, the real substance that causes diseases is bacteria and genetic irregularly.