2009 swine flu pandemic - WikipediaThe 2009 swine flu pandemic, caused by the H1N1/swine flu/influenza virus and declared by the World Health Organization (WHO) from June 2009 to August 2010, was the third recent flu pandemic involving the H1N1 virus (the first being the 1918–1920 Spanish flu pandemic and the second being the 1977 Russian flu).[12][13] The first identified human case was in La Gloria, Mexico, a rural town in Veracr
