Influenzavirus B is a genus in the virus family Orthomyxoviridae. The only species in this genus is called "Influenza B virus". The human immunodeficiency virus (HIV) A virus is a microscopic parasite that infects cells in biological organisms. ... Genera Influenzavirus A Influenzavirus B Influenzavirus C Isavirus Thogotovirus The Orthomyxoviridae are a family of RNA viruses which infect vertebrates. ...
Influenza B viruses are known to infect humans and seals, giving them influenza. [[|Diversity]] Binomial name Homo sapiens Linnaeus, 1758 Trinomial name Type Species Subspecies Homo sapiens idaltu (extinct) Homo sapiens sapiens [[Image: ]] Synonyms Homo (genus). ... Families Odobenidae Otariidae Phocidae Pinnipeds (fin-foots, lit. ... Negatively stained flu virions. ...
The annually updated trivalent flu vaccine consists of hemagglutinin (HA) surface glycoprotein components from influenza H3N2, H1N1, and B influenza viruses. The flu vaccine is a vaccine to protect against the highly variable Influenza virus. ... Hemagglutinin, as depicted in a simplified molecular model. ... The Hong Kong Flu was a pandemic outbreak of influenza that began in Hong Kong in 1968 and spread to the United States of America that year. ...
This limited host range is apparently responsible for the lack of InfluenzavirusB caused influenza pandemics in contrast with those caused by the morphologically similar Influenzavirus A as both mutate by both genetic drift and reassortment.
According to the International Committee on Taxonomy of Viruses the InfluenzavirusBvirus capsid is enveloped while its virion consists of an envelope, a matrix protein, a nucleoprotein complex, a nucleocapsid, and a polymerase complex.
type A, B and C. Of these, type A virus has highest antigenic variability resulting in its antigenic shift and antigenic drift, properties that are major problems for defence and developing vaccine against this virus.
Influenzavirus A and B contain human and animal strains of influenza type A and human strains of influenza type B. Influenzavirus C contains human strains of influenza type C virus and also Swine strains.
Classification of the viruses into A, B, and C is allowed by the antigenic differences of the two internal structural proteins i.e.
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