Medical Dictionary
influenza B
noun \-ˈbē\
Medical Definition of INFLUENZA B
: influenza that is usually milder than influenza A, that may occur in epidemics but not pandemics, and that is caused by an orthomyxovirus (species Influenza B virus of the genus Influenzavirus B) infecting only humans and especially children and having relative genetic stability with a single major serotype
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