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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 virus is a novel strain of the influenza virus, [2] for which existing vaccines against seasonal flu provided no protection. A study at the U.S. Centers for Disease Control and Prevention (CDC) published in May 2009 found that children had no preexisting immunity to the new strain but that adults, particularly those over 60, had some degree of immunity.
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).
The 1918–1920 flu pandemic, also known as the Great Influenza epidemic or by the common misnomer Spanish flu, was an exceptionally deadly global influenza pandemic caused by the H1N1 subtype of the influenza A virus.
On 17 May, the Chilean Health Minister confirmed, the first case of A(H1N1) flu in Chile, [23] the same day two more cases were confirmed. [24] On 29 May, the Chilean Health ministry confirmed the number of cases of A-H1N1 had risen to 224, [23] the same day two more cases were confirmed. [25] On 3 June Chile had its first confirmed death of ...
The first case of H1N1 in Galicia was recorded on 29 April 2009 in the province of Ourense, [23] although it was not confirmed until several days later. [24] The deceased was a woman who had recently travelled to Mexico. Patients with similar symptoms to those of H1N1 had been recorded previously and were considered as possible cases at the time.
The Centers for Disease Control and Prevention (CDC) identified the first two A/09(H1N1) swine flu cases in California on April 17, 2009, via the Border Infectious Disease Program, [135] for a San Diego County child, and a naval research facility studying a special diagnostic test, where influenza sample from the child from Imperial County was tested. [136]
The Belgian interior ministry announced the first case of H1N1 flu in Belgium on 13 May 2009. The infected person was a 28-year-old man living in Ghent who had returned from a holiday in the United States. [24] A second person tested positive for swine flu in Belgium on 14 May 2009. Two persons tested positive for A/H1N1 flu on 15 May 2009. [25]