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3. Characteristics of Type B Flu

Type B flu viruses aren't as capable of mutation as type A. Virologists don't divide type B flu into subtypes but categorize them into lineages and strains.  Currently, all type B flu viruses belong to one of two lineages: B/Yamagata or B/Victoria. Type B flu caused 38 percent of pediatric deaths in the 2010–11 influenza season in the U.S.

type b

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