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The H1N1 form of swine flu is one of the descendants of the strain that caused the 1918 flu pandemic. [ 71 ] [ 72 ] As well as persisting in pigs, the descendants of the 1918 virus have also circulated in humans through the 20th century, contributing to the normal seasonal epidemics of influenza. [ 72 ]
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).
In mid-October, it was reported that flu caused by the H1N1 virus was widespread in 41 states, and flu-like illnesses accounted for 6.1 percent of all doctor visits, which was considered high [citation needed], particularly for October. Forty-three children had died from H1N1 since August 30, which is approximately the number that usually dies ...
Swine flu is usually caused by three subtypes - H1N1, H1N2 and H3N2. They occasionally infect humans, usually after direct or indirect exposure to pigs or contaminated environments.
Swine influenza (also known as swine flu or pig flu) is a respiratory disease that occurs in pigs that is caused by the Influenza A virus. Influenza viruses that are normally found in swine are known as swine influenza viruses (SIVs).
That is exactly what happened with the 2009 H1N1 swine flu and the Spanish flu of 1918 pandemics. Influenza A subtypes ... the virus that causes Covid-19, both flu A and B spread from person to ...
The initial outbreak of a novel [2] swine-origin H1N1 flu pandemic in 2009 and the virus strain that caused it were called by many names. In July 2009, WHO experts named the virus "pandemic H1N1/09 virus" to distinguish it from both various seasonal H1N1 virus strains and the 1918 flu pandemic H1N1 strain.
Influenza A(H1N2)v is similar to flu viruses currently circulating in pigs in the UK