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<blockquote data-quote="JCMaloney" data-source="post: 5675044" data-attributes="member: 2821"><p>There are 3 types of seasonal influenza viruses – A, B and C. Type A influenza viruses are further classified into subtypes according to the combinations of various virus surface proteins. Among many subtypes of influenza A viruses, influenza A(H1N1) and A(H3N2) subtypes are currently circulating among humans.</p><p></p><p>Influenza viruses circulate in all parts of the world. Type C influenza cases occur much less frequently than A and B. That is why only influenza A and B viruses are included in seasonal influenza vaccines.</p><p></p><p>For many years the World Health Organisation has updated its recommendation on vaccine composition twice annually, targeting the 3 (trivalent) most representative virus types in circulation (two subtypes of influenza A viruses and one B virus).</p><p><a href="http://www.influenzacentre.org/centre_GISN.htm" target="_blank">http://www.influenzacentre.org/centre_GISN.htm</a></p></blockquote><p></p>
[QUOTE="JCMaloney, post: 5675044, member: 2821"] There are 3 types of seasonal influenza viruses – A, B and C. Type A influenza viruses are further classified into subtypes according to the combinations of various virus surface proteins. Among many subtypes of influenza A viruses, influenza A(H1N1) and A(H3N2) subtypes are currently circulating among humans. Influenza viruses circulate in all parts of the world. Type C influenza cases occur much less frequently than A and B. That is why only influenza A and B viruses are included in seasonal influenza vaccines. For many years the World Health Organisation has updated its recommendation on vaccine composition twice annually, targeting the 3 (trivalent) most representative virus types in circulation (two subtypes of influenza A viruses and one B virus). [URL]http://www.influenzacentre.org/centre_GISN.htm[/URL] [/QUOTE]
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