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This is a timeline of influenza, briefly describing major events such as outbreaks, epidemics, pandemics, discoveries and developments of vaccines.In addition to specific year/period-related events, there is the seasonal flu that kills between 250,000 and 500,000 people every year and has claimed between 340 million and 1 billion human lives throughout history.
For the 1918 flu, people infected numbers (500 million), mortality rate (2~3%) contradict the deaths worldwide "20–100 million" statements. Review needed. Lead: Johnson NPAS, Mueller (2002). "Updating the Accounts: Global Mortality of the 1918–1920 Spanish Influenza Pandemic". Kilbourne ED (January 2006). "Influenza pandemics of the 20th ...
1957–1958 influenza pandemic: Influenza A/H2N2: 1–4 million – 1957–1958 Worldwide 12 Hong Kong flu: Influenza A/H3N2: 1–4 million – 1968–1969 Worldwide 10 1918–1922 Russia typhus epidemic: Typhus: 2–3 million 1–1.6% of Russian population [14] 1918–1922 Russia: 13 Cocoliztli epidemic of 1576: Cocoliztli 2–2.5 million
Community outbreaks, June 2009 Confirmed cases by state, June 3, 2009. This article covers the chronology of the 2009 novel influenza A pandemic.Flag icons denote the first announcements of confirmed cases by the respective nation-states, their first deaths (and other major events such as their first intergenerational cases, cases of zoonosis, and the start of national vaccination campaigns ...
The following is a list of WHO recommended strains for the Northern Hemisphere influenza season. Starting in the 2012–2013 season, the recommendation shifted to include the composition of a quadrivalent influenza vaccine (QIV) that contains both influenza B lineages, alongside a trivalent influenza vaccine (TIV) containing one influenza B lineage.
The second wave came with the influx of influenza A viruses, such as H1N1. [3] According to preliminary burden estimates for the 2019–2020 flu season (October 1, 2019 through April 4, 2020) there were between 39 and 56 million flu cases; 18–26 million doctor visits; 410,000 to 740,000 hospitalizations, and between 24,000 and 62,000 deaths.
Many states across the U.S. have been placed in the ‘high’ or ‘very high’ category in the CDC’s Weekly Influenza Surveillance Report, which assesses activity levels of respiratory illness.
The 1918 flu pandemic, commonly referred to as the Spanish flu, was a category 5 influenza pandemic caused by an unusually severe and deadly Influenza A virus strain of subtype H1N1. The difference between the influenza mortality age-distributions of the 1918 epidemic and normal epidemics.