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A high-dose vaccine (Fluzone High-Dose) four times the strength of standard flu vaccine was approved by the FDA in 2009. [22] [23] [24] This vaccine is intended for people 65 and over, who typically have weakened immune response due to normal aging. The vaccine produces a greater immune response than standard vaccine.
Influenza vaccines, colloquially known as flu shots [28] or the flu jab, [29] are vaccines that protect against infection by influenza viruses. [ 30 ] [ 31 ] New versions of the vaccines are developed twice a year, as the influenza virus rapidly changes. [ 30 ]
That same year, the Spanish flu spread across North America, spread in part through infected soldiers returning from overseas. [7] Connaught swiftly intervened with large quantities of what Robert Defries described as an "experimental" vaccine, freely supplying it to health services and hospitals across the country as well as to several U.S ...
The flu is a common infection, affecting billions of people each year. The World Health Organization also estimates that the flu is responsible for 3-5 million cases of severe illness and 290,000 ...
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.
That is exactly what happened with the 2009 H1N1 swine flu and the Spanish flu of 1918 pandemics. Influenza A subtypes Influenza A (but not B) also has subtypes labeled H and N.
In the worldwide 1918 flu pandemic, "physicians tried everything they knew, everything they had ever heard of, from the ancient art of bleeding patients, to administering oxygen, to developing new vaccines and sera (chiefly against what we now call Hemophilus influenzae – a name derived from the fact that it was originally considered the ...
In seasons where the flu vaccine matches circulating strains, the flu shot has historically been shown to reduce the risk of going to the doctor by 40% to 60% in seasons, according to the CDC.