It is said that the first pandemic (meaning affecting many people or a wide area) in 1918 killed about 20 -40 million people worldwide, which originated from birds. The influenza A (A1N1) or "spanish flu" still circulate today after being introduced again into the human population in 1977.
The second pandemic in 1957 called the "asian flu" had over 700000 victims, many in the US. The elderly had the highest rates of deaths.
Making it the mildest pandemic in the 20th century was the "Hong Kong flu" in 1968 with roughly 350 000 deaths.
It is widely believed that the Spanish Flu mutated into Avian Flu Virus in 2003.
The latest pandemic or "swine flu" orginated in Mexico was identified in April 2009.
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