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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 A and B viruses are genetically similar enough to be included in the same family of viruses, the Orthomyxoviridae family. However, their genetic differences are significant enough to warrant separating the viruses into two different types, A and B. Influenza A viruses are further categorized by subtype and strain. Influenza B viruses are categorized only by strain.