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.
How long is a person with the flu contagious? You can pass the flu to others from 1 day before you have symptoms up to 5-7 days after you get sick. Some people might be able to infect others even longer. Is there treatment? The flu can be treated with antiviral drugs if started soon after you get sick. They will help reduce how sick you get and how long you are ill.