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The 1918 flu was an unusually severe and deadly strain of H1N1 [12] avian influenza, which killed from 17 [13] to 50 or more million people worldwide over about a year in 1918 and 1920. It was one of the deadliest pandemics in human history .
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 H1N1 pandemic of 2009 was the first public health emergency of international concern designated by the World Health Organization. While H1N1/09 was the primary strain of flu seen that year, it was not unusually contagious or lethal. Most cases were mild, although those who had to be hospitalized were often severely ill.
That is exactly what happened with the 2009 H1N1 swine flu and the Spanish flu of 1918 pandemics. Influenza A subtypes. ... (Beware of these deadly flu signs.) How are influenza A and B transmitted?
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.
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 ]
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 ...
A new CDC report details risk factors for developing severe flu. People hospitalized with the virus over the past 13 years were more likely to have at least one of these risk factors.