The flu virus can live for up to 3 to 5 days in your body and your bodies natural built in immune system helps to fight off the flu virus and kill the flu virus.
It can take 3 to 5 days for the virus to be killed in your body by your immune system but sometimes the immune system can ward off and kill the flu virus within a few days.
But you still may be feeling tired and fatigued for at least a week after that.
Most times a person with the flu is no longer contagious after 3 to 5 days of getting the flu.
So make sure you stay home from work or school for at least 5 days so that you allow enough time for the flu virus to be killed in your body and so that you will no longer infect other people.