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influenza1 a: any of several acute highly contagious respiratory diseases caused by strains of three major orthomyxoviruses now considered to comprise three species assigned to three separate genera: (1): influenza a (2): influenza b (3): influenza c b: any human respiratory infection of undetermined cause —not used technically2: any of numerous febrile usually virus diseases of domestic animals (as shipping fever of horses) marked by respiratory symptoms, inflammation of mucous membranes, and often systemic involvement
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