Where Did The 2009 H1n1 Flu Virus Come From
The Spanish flu also known as the 1918 influenza pandemic was an unusually deadly influenza pandemic caused by the H1N1 influenza A virusLasting from February 1918 to April 1920 it infected 500 million people about a third of the worlds population at the time in four successive waves. H1N1 strain of the swine flu virus.
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The H1N1 swine flu emerged in Mexico in April 2009 infecting 608 million people in the United States alone and at least 700 million worldwide.
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