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Influenza B
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The main flu (influenza) stains affecting humans are [[Influenza A|influenza type A]] strains and '''influenza type B''' strains. Both influenza A and B consist of a number of different strains that circulate across the world, with infections peaking each winter.<ref name="types">{{Cite web | url = https://www.cdc.gov/flu/about/viruses/types.htm | title = Types of Influenza Viruses | last = | first = | authorlink = | date = 2021-11-02 | website = [[Centers for Disease Control and Prevention]]|language=en-us|archive-url=|archive-date=|url-status=|access-date=2021-11-11}}</ref> ==Strains == Influenza type B strains are classified into two lineages: * Yamagata * Victoria Each of these can be classified further into subtypes and variants.<ref name="types" /> ==Pandemic flu== Influenza type B strains have not been known to cause pandemics; all pandemics traced have been influenza type A strains, including the [[Influenza A virus subtype H1N1#Spanish_flu| Spanish flu]] (1918-1919), and the [[Influenza A virus subtype H1N1|H1N1 swine flu]] (2009-2010) pandemics.<ref name="types" /><ref name="PMC3004067">{{Cite journal | last = Anhlan | first = Darisuren | authorlink = | last2 = Grundmann | first2 = Norbert | authorlink2 = | last3 = Makalowski | first3 = Wojciech | authorlink3 = | last4 = Ludwig | first4 = Stephan | authorlink4 = | last5 = Scholtissek | first5 = Christoph | authorlink5 = | date = Jan 2011 | title = Origin of the 1918 pandemic H1N1 influenza A virus as studied by codon usage patterns and phylogenetic analysis | url = https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3004067/|journal=RNA|volume=17|issue=1 | pages = 64β73|doi=10.1261/rna.2395211|issn=1355-8382|pmc=3004067|pmid=21068184|access-date=|quote=|via=}}</ref> ==Influenza vaccines== Annual [[influenza vaccine]]s protect against '''both''' groups of inflenza B, and many subtypes of inflenza A virus.<ref name="flu-jab">{{Cite web | title = Key Facts About Seasonal Flu Vaccine | last = | first = | authorlink = | date = 2021-11-02 | website = [[Centers for Disease Control and Prevention]]|language=en-us|archive-url=|archive-date=|url-status=|access-date=2021-11-11 | url = https://www.cdc.gov/flu/prevent/keyfacts.htm}}</ref> ==See also == * [[Influenza]] (seasonal) * [[Influenza vaccine]] * [[Influenza A]] * [[Vaccine]] ==Learn more == * [https://www.cdc.gov/flu/about/viruses/types.htm Types of Inflenza] - CDC ==References == {{Reflist}} [[Category:Triggers and risk factors]] [[Category:Virology]] [[Category:Viruses]] [[Category:Influenza viruses]]
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