An acute viral infection of the respiratory tract, occurring in isolated cases, in epidemics, or in pandemics; it is caused by serologically different strains of viruses (influenzaviruses) designated A, B, and C, has a 3-day incubation period, and usually lasts for 3 to 10 days. It is marked by inflammation of the nasal mucosa, pharynx, and conjunctiva; headache; myalgia; often fever, chills, and prostration; and occasionally involvement of the myocardium or central nervous system. The disease is influenza (MONDO_0005812). Also known as: Influenza with other manifestations, flu, influenza infection, influenza with non-respiratory manifestation, orthomyxoviridae caused disease or disorder, orthomyxoviridae disease or disorder, orthomyxoviridae infectious disease.