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Influenza B virus is the only species in the genus Betainfluenzavirus in the virus family Orthomyxoviridae . Influenza B virus is only known to infect certain mammal species, including humans, ferrets, pigs, and seals. [ 4][ 5] This limited host range is apparently responsible for the lack of influenza pandemics associated with influenza B ...
D04536. Influenza vaccines, colloquially known as flu shots, are vaccines that protect against infection by influenza viruses. [ 14][ 15] New versions of the vaccines are developed twice a year, as the influenza virus rapidly changes. [ 14] While their effectiveness varies from year to year, most provide modest to high protection against ...
Fluzone is typically administered in a single dose by intramuscular injection; [20] an intradermal injection is also available. [21] It is presented as a 0.25 ml syringe for pediatric use, as a 0.5 ml syringe for adults and children, as a 0.5 ml vial for adults and children, and as a 5 ml vial for adults and children. [20]
Polyvalent influenza vaccine. Polyvalent influenza vaccine is a type of influenza vaccine that provides immunity against more than one type of antigen. [1] In the second week after receiving the flu shot, the body's immune system is triggered by the antigens so the body starts producing antibodies. These antibodies help fight against influenza ...
Influenza, commonly known as " the flu " or just " flu ", is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin one to four (typically two) days after exposure to the virus and last for about ...
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.
Influenza (flu) The Centers for Disease Control and Prevention (CDC) estimates that, as of April 4, 2020, the 2019–2020 United States flu season had caused 39 million to 56 million flu illnesses, 410,000 to 740,000 hospitalizations and 24,000 to 62,000 deaths. [ 1] In January 2020, the Director of the National Institute of Allergies and ...
Influenza Vaccine. Vaccine efficacy or vaccine effectiveness is the percentage reduction of disease cases in a vaccinated group of people compared to an unvaccinated group.For example, a vaccine efficacy or effectiveness of 80% indicates an 80% decrease in the number of disease cases among a group of vaccinated people compared to a group in which nobody was vaccinated.