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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.
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
Major modern influenza pandemics [1] [2]; Name Date World pop. Subtype Reproduction number [3] Infected (est.) Deaths worldwide Case fatality rate Pandemic severity
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.
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza (flu). The season occurs during the cold half of the year in each hemisphere. It takes approximately two days to show symptoms. Influenza activity can sometimes be predicted and even tracked geographically.
US influenza statistics by flu season. From the Centers for Disease Control and Prevention page called "Disease Burden of Flu": "Each year CDC estimates the burden of influenza in the U.S. CDC uses modeling to estimate the number of flu illnesses, medical visits, hospitalizations, and deaths related to flu that occurred in a given season.
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.
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.