influenza
"Went to doctor yesterday, after one full day of a low grade fever, chills, aches, and  stuffy nose with a little chest congestion.  I didn't feel like I got hit by a Mack truck, still went to work etc.  I decided to go to the doctor earlier than I normally would have.  They did a swab test and confirmed I had the flu.  They gave me Tamiflu.  It's been about 36 hours and three doses into it and I feel at least 90% better.  My wife's doctor prescribed it for her as a preventative.  Neither of us have had any side effects.  We both took them with food."