E. faecalis is one of the flora of the human intestinal tract, which is harmless to humans under normal circumstances, and can cause disease only if the human body experiences flora imbalance and decreased immune function. As a human intestinal flora, fecal enterococci play a certain role. It can adhere to the intestinal mucosa and inhibit the adhesion of other pathogenic bacteria to maintain intestinal health. E. faecalis produces bacteriocins, lactic acid and hydrogen peroxide during metabolism to lower intestinal pH to maintain intestinal microecological balance. E. faecalis also produces nutrients as well as interferons and cytokines that play a role in human health. However, when the human body uses antibiotics in large quantities or when immunity is low, E. faecalis can leave its normal host site and enter other tissues, at which time E. faecalis will become pathogenic and cause disease. When E. faecalis infection occurs, patients should go to the hospital in time for targeted treatment to avoid delays and adverse consequences.