The autonomic nervous system (ANS) regulates the functions of our internal organs (the viscera) such as the heart, stomach and intestines.
The flu is contagious a day before and five days to a week after its onset. Young children, people over 65, those with compromised immune systems, and people with a terminal illness are at risk of death from the flu.
Flu: Technically the flu is considered contagious for 5-10 days after the start of symptoms. Basic infection control practices: good hand washing, don't share drinks, utensils, cough or sneeze into a tissue or into your shirt sleeve.