Tested positive for the flu yesterday, fever as high as 100.8. today, i don't have a fever anymore, and i feel well. when can i return back to school?

After few more days: After having 2-3 days of flu symptoms, a person is still quite contagious. It is hard to tell when a person is not contagious, because that varies from case to case, and because the viruses decrease over a few days (they don't all die at exactly one moment in time). The safer thing to do is to avoid spreading viruses (avoid touching others, or sneezing or coughing at others) for a week.