An influenza pandemic is an epidemic of an influenza virus that spreads on a worldwide scale and infects a large proportion of the world population. There have been about three influenza pandemics in each century for the last years, the most recent one being the flu pandemic. Influenza pandemics occur when a new strain of the influenza virus is transmitted to humans from another animal species. Species that are thought to be important in the emergence of new human strains are pigs, chickens and ducks.
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The "Asian Flu" was a category 2 flu pandemic outbreak of avian influenza that originated in China in early lasting until It originated from mutation in wild ducks combining with a pre-existing human strain. Death toll in the US was approximately 69,
Asian flu of , also called Asian flu pandemic of , outbreak of influenza that was first identified in February in East Asia and that subsequently spread to countries worldwide. The Asian flu was the second major influenza pandemic to occur in the 20th century; it followed the influenza pandemic of —19 also known as Spanish flu and preceded the Hong Kong flu pandemic of The Asian flu outbreak caused an estimated one million to two million deaths worldwide and is generally considered to have been the least severe of the three influenza pandemics of the 20th century. The outbreak was caused by a virus known as influenza A subtype H2N2 , or Asian flu virus. Research has indicated that this virus was a reassortant mixed species strain, originating from strains of avian influenza and human influenza viruses.