The precautions of BCG vaccine mainly include prohibition of subcutaneous or intramuscular injection; cracked vaccine vials should not be inoculated, etc. Contraindications include nephritis, heart disease, eczema and other diseases, etc., which are prohibited to be inoculated. Functions and Indications: After vaccination, the vaccine can make the body produce cellular immune response, which is used to prevent tuberculosis. Adverse reactions: two weeks after vaccination, local redness, swelling, pus, ulcers and other symptoms may appear, and should consult a doctor in time. Contraindication: People suffering from acute infectious diseases, tuberculosis, heart disease, nephritis, immunodeficiency, eczema and other skin diseases should not be vaccinated. Precautions: subcutaneous or intramuscular injection is strictly prohibited; when applying the vaccine, attention should be paid to avoiding the use of light; the syringe for BCG vaccination must be used exclusively, and must not be used for other injections; vaccine vials that are cracked must not be used; Vaccination recipients must register their names, ages, genders, residential addresses and relevant information such as vaccine batch number, production unit and vaccination date in detail. Relevant precautions and contraindications for vaccination should be subject to the instruction of the doctor at the vaccination office.