BCG vaccine is a vaccine prescribed within 24 hours after the baby’s birth and the first vaccination for babies, which is used to prevent infantile tuberculosis. Tuberculosis has been an infectious disease since ancient times, and in ancient times, people were not vaccinated and many died from the white plague, while the invention of BCG vaccine saved countless lives. The success of BCG vaccination The special thing about BCG vaccination is that it will septicize and then leave a scar after the vaccination. The scar on the wall of our left hand is left by the BCG vaccination. If a baby is not vaccinated with BCG within 24 hours of birth, it should be replaced within 3 months. The average diameter of local redness at the injection site of BCG vaccine is 5-10 mm, which is a normal strong positive phenomenon, indicating that BCG vaccination is successful, but if there is no local redness or redness <5 mm, it is negative, indicating that the vaccination may be unsuccessful and the vaccine is not viable in the body. Generally, local redness, infiltration, pus formation and small ulcers appear around 2 weeks after BCG vaccination, and appropriate treatment is appropriate for serious cases. If the local lymph nodes are swollen, hot compresses can be applied; if pustules have been softened, sterilized syringes can be used to draw pus; if perforation has occurred, 10% sulfonamide ointment or 20% para-aminoleucine ointment can be used.