For symptoms of septicemia, link to it here in Wisegeek. See why it is as fatal now as it was 100 years ago, even though we have good drugs to fight it. People wait too long to get treatment, or are made to defer treatment by medical staff who miss the symptoms. It is dangerous, folks.
I survived, but have had 27 years of poor health. You are at risk after childbirth (especially a C-section) or if you have bowel surgery (or a bowel obstruction). I'm sure there are many other risk factors, but I'm not a doctor and could not state them here.