As for symptoms of fullblown influenza infection: high fever (103+) that only partially responds to ASA/tylenol/ibuprofen, severe muscle aches, cough, chest pain with deep breathing and coughing, severe headache. Other symptoms may present as well. In its worst form, it can produce hemorrhagic symptoms/signs such as bloody diarrhea, hemoptysis (coughing up blood), and blood in the urine.
That's the one! You don't forget it.
