Blood infections are infections of the bloodstream with various pathogenic microorganisms, commonly bacteria, fungi and viruses. Blood infection is life-threatening, and the most dangerous type is sepsis after bacterial infection. Sepsis often occurs in patients with severely low immunity, such as patients with long-term application of hormones, or after chemotherapy for malignant tumors, conditionally pathogenic bacteria and pathogenic bacteria will invade into the bloodstream and release toxins in the bloodstream in large numbers, leading to chills, chills, high fever, petechiae and purpura of the skin and mucous membranes, and so on. If the infection is not well controlled, sepsis will develop further and may affect the brain, joints, liver, kidneys and other organs, and form abscesses locally, which is called “septicemia”, and the patient’s risk will be very high. A significant number of patients will die due to poor infection control.