BCG vaccination specifically for the left and right arm are no difference, mainly in the outer wall of the upper arm in the middle of the deltoid muscle slightly below the intradermal injection. About 2 weeks after inoculation, local redness, swelling and infiltration can appear, if then pus, the formation of small ulcers, can be 1% gentian violet coated to prevent infection. Generally 8~12 weeks after the scab. If the local lymph nodes are enlarged and softened to form pustules, timely diagnosis and treatment should be made. Patients suffering from tuberculosis, acute infectious diseases, nephritis, eczema and immunodeficiency disorders are prohibited from vaccination. BCG vaccine is usually administered 24 hours after the birth of a newborn, and usually only one injection is given. If the baby is born prematurely or suffocated at birth, etc., and cannot be vaccinated in time, it should be replenished in time within three months after birth.