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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.
Type A influenza virus is the most virulent form of influenza and the one that causes the most severe illness. This virus often originates in populations of wild birds, poultry, or swine (including pigs and hogs), so different strains are sometimes referred to as avian (bird) or swine flu.ype B influenza is not divided into subtypes, but the virus does mutate into different strains. Unlike Type A, Type B influenza is active throughout the year. Nevertheless, it generally causes a much milder form of the flu than Type A viruses.