where I am, this influenza virus seems to have hit pretty hard, and it only last about 2 to three days for those with a descent immune system, those who are less lucky, it seems to develope into more serious junk like pnemonia, or bronchitis and such. Seems to begin with a runny nose, then headaches, body aches, fever and chills. pain in chest and a cough. They say they are really weak and tired also. then about 3 days later, back to normal aside from a lingering cough.