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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.
Influenza B causes milder disease and affects only humans, primarily children.Subtypes of the type A influenza virus are identified by two antigens (proteins involved in the immune reaction) on the surface of the virus. These antigens can change, or mutate, over time.