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Hace 4 días · 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 influenza A virus.
- February 1918 – April 1920
- Worldwide
- 25–50 million (generally accepted), other estimates range from 17 to 100 million
- Influenza
Hace 4 días · This H1N1 strain was antigenically similar to the H1N1 strains that circulated prior to 1957. Since 1977, both H1N1 and H3N2 have circulated in humans as part of seasonal influenza. [1] In 1980, the classification system used to subtype influenza viruses was introduced.
- Influenza viruses
- >290,000–650,000 deaths per year
3 de may. de 2024 · Influenza A H1N1, virus that is best known for causing widespread outbreaks, including epidemics and pandemics, of acute upper or lower respiratory tract infection. The influenza A H1N1 virus is a member of the family Orthomyxoviridae (a group of RNA viruses). Type A is one of the three major types.
- The Editors of Encyclopaedia Britannica
Hace 1 día · e. Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus, which causes influenza (flu), predominantly in birds. It is enzootic (maintained in the population) in many bird populations, and also panzootic (affecting animals of many species over a wide area). [1] A/H5N1 virus can also infect mammals (including humans) which ...
7 de may. de 2024 · The H1N1 virus that caused the outbreak was discovered to possess genetic material from human, avian, and two different swine influenza viruses. The 2009 H1N1 outbreak was not nearly as deadly as the pandemic of 1918–19. However, the virus was highly contagious and spread rapidly.
- The Editors of Encyclopaedia Britannica
- Influenza is an acute viral infection of the upper or lower respiratory tract marked by fever, chills, and a generalized feeling of weakness and pa...
- Influenza is caused by several closely related viruses in the family Orthomyxoviridae, an RNA virus group. Influenza viruses are categorized as typ...
- Pandemics are worldwide outbreaks of a disease and are estimated to occur on average once every 50 years for influenza. Epidemics happen much more...
- When an influenza pandemic emerges, WHO adheres to its six-phase preparedness plan. Phases 1–3 are the early stages in pandemic preparedness design...
- The symptoms of influenza include sudden and distinct chills, fatigue, and muscle aches. A person’s body temperature rises rapidly to 38–40 °C (101...
27 de abr. de 2024 · El virus de la gripe o influenza pertenece a la familia de los Orthomyxovirus. En realidad, existen cuatro tipos (A, B, C y D), genéticamente distintos. En humanos, la gripe A es la más frecuente; la B aparece cada 2-4 años y suele ser menos problemática; la C es más rara y suele causar infecciones leves, y los virus de tipo D afectan al ganado.
23 de abr. de 2024 · Overview. During 2020, highly pathogenic avian influenza (HPAI) A (H5N1) clade 2.3.4.4b viruses arose from previously circulating influenza A (H5Nx) viruses and spread predominantly via migratory birds to many parts of Africa, Asia and Europe.
