The main flu (influenza) stains affecting humans are 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.
Strains[edit | edit source]
Influenza type B strains are classified into two lineages:
Each of these can be classified further into subtypes and variants.
Pandemic flu[edit | edit source]
Influenza type B strains have not been known to cause pandemics; all pandemics traced have been influenza type A strains, including the Spanish flu (1918-1919), and the H1N1 swine flu (2009-2010) pandemics.
Influenza vaccines[edit | edit source]
See also[edit | edit source]
Learn more[edit | edit source]
- Types of Inflenza - CDC
References[edit | edit source]
- "Types of Influenza Viruses". Centers for Disease Control and Prevention. November 2, 2021. Retrieved November 11, 2021.
- Anhlan, Darisuren; Grundmann, Norbert; Makalowski, Wojciech; Ludwig, Stephan; Scholtissek, Christoph (January 2011). "Origin of the 1918 pandemic H1N1 influenza A virus as studied by codon usage patterns and phylogenetic analysis". RNA. 17 (1): 64–73. doi:10.1261/rna.2395211. ISSN 1355-8382. PMC 3004067. PMID 21068184.
- "Key Facts About Seasonal Flu Vaccine". Centers for Disease Control and Prevention. November 2, 2021. Retrieved November 11, 2021.
Centers for Disease Control and Prevention (CDC) - The Centers for Disease Control and Prevention is a U.S. government agency dedicated to epidemiology and public health. It operates under the auspices of the Department of Health and Human Services.