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Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin one to four (typically two) days after exposure to the virus and last for about two to eight days.
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza (flu). The season occurs during the cold half of the year in each hemisphere. It takes approximately two days to show symptoms. Influenza activity can sometimes be predicted and even tracked geographically.
The contagious period. People with the flu are the most contagious during the first three to four days of having symptoms, per the CDC, although you could technically be contagious longer than that.
Flu viruses can remain infectious for about one week at human body temperature, over 30 days at 0 °C (32 °F), and indefinitely at very low temperatures (such as lakes in northeast Siberia). Most influenza strains can be inactivated easily by disinfectants and detergents. [10] [11] [12] Flu spreads around the world in seasonal epidemics.
Flu season typically starts in December, rises significantly in January and February, and then starts to decline in March, “give or take a few weeks,” Murphy says.
What to expect regarding flu, RSV, the common cold and seasonal allergies this fall. ... And during an annual conference hosted by the CDC and the National Foundation for Infectious Diseases on ...
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