1918: The Spanish flu pandemic remains the most devastating outbreak of modern times - infecting up to 40% of the world's population and killing more than 50m people, with young adults particularly badly affected.1957: Asian flu killed two million people. Caused by a human form of the virus, H2N2, combining with a mutated strain found in wild ducks. The elderly were particularly vulnerable.
1968: An outbreak first detected in Hong Kong, and caused by a strain known as H3N2, killed up to one million people globally, with those over 65 most likely to die.
Swine Flu: Swine flu is a respiratory disease found in pigs. Human cases usually occur in those who have contact with pigs. Human-to-human transmission is rare and such cases are closely monitored
Source: BBC
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