What are the different types of influenza viruses?
There are three types of influenza viruses: A, B and C. Virus A and B cause seasonal flu while C is typically associated with mild illness in children and young adults.
Influenza B and C virus have limited genetic diversity as both are restricted to a single specie each. Influenza type A virus has several sub-species. These species are classified on the basis of different combinations of hemaglutinin (HA) and neuraminidase (NA) — the proteins on its surface. For instance the H1N1 is an A type influenza virus that has an HA1 and an NA1 protein. Except H17N10, all known subtypes of influenza A virus can infect birds. The H17N10 virus is found in bats.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/news/new-bird-flu-virus-can-unleash-pandemic
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birds
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/avian-flu
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/influenza
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/animal-diseases
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/animal-care
