Associated with an epidemic in 2009, this virus first appeared in the form of the Spanish Flu of 1918. Name that type of influenza A.
Answer H1N1
The 1918 H1N1 flu was originally from an avian strain that passed to humans. Because there was no pre-existing immunity, the virus fueled a widespread pandemic, infecting up to a third of the global population and resulting in a vast number of deaths.
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