influenza
"I was recovering from bacterial pneumonia and feeling very, very good.  Suddenly my cough returned, I had the chills, was running a fever and felt achy all over.  I was able to get into the Doc immediately, was swabbed for influenza and tested positive for Influenza Type A.  Tamiflu was ordered.  Day one I was able to take one pill, this is day 3 and I feel at least 90% better.  No side effects and thankful I went back to my physician for follow-up care.  PS. I had both the pneumonia and flu shot this year.  Thank you, Tamiflu."