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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 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.
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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).
A semi-logarithmic chart of laboratory-confirmed A(H1N1) influenza cases by date according to WHO reports. [196] Mexico, USA, and Canada are shown as a breakdown of the total. In the United States, initial reports of atypical flu in two individuals in southern California led to the discovery of the virus by the Center for Disease Control in
Patients with similar symptoms to those of H1N1 had been recorded previously and were considered as possible cases at the time. The first was detected in Mos [25] on 27 April 2009 in a middle-aged male patient [26] who had arrived from Mexico several days beforehand. The first flu case in Spain was confirmed on the same day in Almansa, but was ...
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 ...