The onset of flu is usually very sudden - one can often pinpoint the exact hour when you start feeling ill.
The incubation period from exposure to the virus to onset of symptoms is 1- 4 days, the symptoms last another 3 -4 days.
Symptoms include a sudden onset of fever and chills, aching muscles, a dry cough, headache, fatigue and sometimes a sore throat or runny nose.
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