What are the clinical features of influenza ?
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Influenza, commonly known as the flu, is an infection of the respiratory system caused by a virus. The clinical features of influenza include:
– Abrupt onset of constitutional and upper respiratory tract signs and symptoms such as fever, chills, myalgia, headache, malaise, nonproductive cough, sore throat, and rhinitis.
– Atypical signs and symptoms of influenza virus infection can occur, including in frail, institutionalized elderly long-term care facility residents.
– Among young children with influenza, nausea, vomiting or diarrhea may also occur with respiratory symptoms.
– Uncomplicated influenza signs and symptoms typically resolve after 3-7 days for the majority of people, although cough and malaise can persist for >2 weeks, especially in elderly people and those with chronic lung disease.