Flu in Adults (cont.)
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Flu in Adults Symptoms and Signs
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A sudden increase in the number of school-aged children sick at home with flu-like illness may indicate the arrival of flu season. This outbreak is soon followed by similar infection in other age groups, especially among adults.
Symptoms usually come on suddenly.
Medically Reviewed by a Doctor on 12/18/2014
Steven Fine, MD, PhD
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Influenza virus infection, one of the most common infectious diseases, is a highly contagious airborne disease that causes an acute febrile illness and results in variable degrees of systemic symptoms, ranging from mild fatigue to respiratory failure and death.