Flu in Adults (cont.)
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What Are Symptoms and Signs of Flu in Adults?
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Symptoms usually come on suddenly.
What Is the Incubation Period for Flu in Adults?
The incubation period is the time between exposure to the virus and symptoms of illness. The incubation period for the flu is from two to four days.
Flu vs. Cold
Differentiating a cold from the flu by symptoms alone can sometimes be difficult or impossible, but in general, people with the flu get sick more suddenly, look much sicker, and feel much weaker than if the ailment were a common cold. Higher fever, body aches, extreme tiredness, and dry cough are more often symptoms of the flu, whereas runny or stuffy nose are more often associated with common colds.
Medically Reviewed by a Doctor on 11/30/2015
Steven Fine, MD, PhD
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Flu in Adults - Symptoms
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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.