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The G4 virus, also known as the "G4 swine flu virus" (G4) and "G4 EA H1N1", is a swine influenza virus strain discovered in China. [68] The virus is a variant genotype 4 (G4) Eurasian avian-like (EA) H1N1 virus that mainly affects pigs, but there is some evidence of it infecting people. [ 68 ]
The pandemic H1N1/09 virus is a swine origin influenza A virus subtype H1N1 strain that was responsible for the 2009 swine flu pandemic. This strain is often called swine flu by the public media due to the prevailing belief that it originated in pigs. The virus is believed to have originated around September 2008 in central Mexico.
Swine influenza virus (SIV) or swine-origin influenza virus (S-OIV) refers to any strain of the influenza family of viruses that is endemic in pigs. [2] As of 2009, identified SIV strains include influenza C and the subtypes of influenza A known as H1N1 , H1N2 , H2N1, H3N1 , H3N2 , and H2N3 .
The 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).
A(H1N1) Outbreak and Pandemic Milestones 17 March First case in the world of what was later identified as swine flu origin. 28 March First country's case affected the disease in the US of what was later identified as swine flu origin. 12 April First known death due to what was later identified as swine flu origin. 24 April
There have been various H1N1 strains. [5] The 1918 Spanish flu was caused by an H1N1 strain, and H1N1 strains afterwards became endemic and circulated around the world until 1957, when they all but vanished. (There were some isolated reports of other H1N1 strains such as the one in the early 1960s. [17]) H1N1 reappeared in 1977 and the strain ...
This chronology is heavily influenced by the official history of the affair, published in 1978 by the National Academies Press: The Swine Flu Affair: Decision-Making on a Slippery Disease. [4] In January 1976, several soldiers at Fort Dix complained of a respiratory illness diagnosed as influenza. The next month, Private David Lewis, who had ...
It was caused by a novel H1N1 strain that was a reassortment of human, swine, and avian influenza viruses. [20] [4] The 2009 pandemic had the effect of replacing prior H1N1 strains in circulation with the novel strain but not any other influenza viruses. Consequently, H1N1, H3N2, and both influenza B virus lineages have been in circulation in ...