Enterococcus faecalis is a bacterium, also known as Streptococcus faecalis, which is a gram-staining positive coccus. Enterococcus faecalis is a normal flora in the human intestinal tract and normally lives in the human intestinal tract and the female genitourinary tract. The human stool contains a large number of E. faecalis, about 10^7 per gram of stool. However, in cases where the immunity of the human body is reduced due to the application of immunity-suppressing drugs, in cases of old age and weakness, in cases where the epidermis and mucous membranes are broken due to invasive operations and treatment of patients, inappropriate use of antibiotics and excessive use of antibiotics, etc., Enterococcus faecalis infections can occur, causing genitourinary infections, abdominal infections, wound infections, infections of the lining of the heart and bacteraemia It can also lead to infection of the lining of the heart and bacteraemia. Since Enterococcus faecalis has a thick cell wall and is resistant to many antibiotics, it is difficult to treat the infection in humans.