Septicemia is a life-threatening blood infection caused by bacteria entering the bloodstream from a site of infection. Common symptoms include fever, rapid breathing/heartbeat, low blood pressure, and mental confusion. Bacteria such as E. coli, streptococcus pneumoniae, and salmonella are often involved. The document details types, causes, diagnosis, and treatment of septicemia, including antibiotics and supportive care. It concludes by emphasizing the importance of preventing and promptly treating infections to avoid septicemia.