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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.
Researchers divide flu viruses into three general categories: types A, B, and C. All three types can mutate, or change into new strains, and type A influenza mutates often, yielding new strains of the virus every few years. This means that you can never develop a permanent immunity to influenza.