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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] A 2020 peer-reviewed paper from the Proceedings of the National Academy of Sciences ( PNAS ) stated that "G4 EA H1N1 viruses possess all the essential hallmarks of being highly adapted to ...
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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 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 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 virus, H1N1, remained endemic, occasionally causing more severe or otherwise notable outbreaks as it gradually evolved over the years. [171] The period since its initial appearance in 1918 has been termed a "pandemic era", in which all flu pandemics since its emergence have been caused by its own descendants. [ 172 ]
On May 10, a 30-year-old man with underlying health problems died in Washington from H1N1, the first fatality in that state. [30] On May 17, 55-year-old Mitchell Wiener, an assistant principal at Intermediate School 238 in Hollis, Queens died from H1N1, making it the first H1N1 related fatality in the state of New York. Wiener suffered from ...
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