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Type B Influenza: Type B influenza is a subtype of the influenza virus that tends to occur sporadically-can cause epidemics but not pandemics.
I heard that only Influenza type A leads to pandemics situation since type B (or C) Influenza has only one HA and NA type. I donât understand why the types B and C have only one HA and NA type when the type A has a lot of different ones. And I donât understand the link between this and the capacity of producing pandemic. Thank you