not sure how true it is, but I have heard you are "sick" with the flu an average of a day before you show symptoms. viral load, and then bodily reaction. and same thing on the back end. i was always told to wait 24 hours after the fever broke, because you are still sick but now your body is in control and doesn't need to use higher temps to fight the virus anymore.
maybe one of our actual medical people can debunk my beliefs or add some jargon to make it sound legit.
You can also have asymptomatic flu.

