Prevention is better than cure. BCG vaccination can make the body resistant to TB to prevent TB (commonly known as consumption). Infants and children have the weakest resistance and are prone to acute tuberculosis, such as tuberculous meningitis, which can be life-threatening if they are infected with tuberculosis bacteria, so every infant should be vaccinated with BCG. Babies born normally, weighing at least 2,500 grams, can be vaccinated with BCG after 24 hours of birth and should be vaccinated by the age of 1 week at the latest. How soon after vaccination does sepsis begin? After BCG vaccination, newborns usually start to develop redness and pus about 2 weeks after vaccination. After 1-2 weeks, the vaccination site will become red and swollen, with an average diameter of about 10mm, and will grow gradually, with slight pain and itching, but no fever; 6-8 weeks, pustules or ulcers will form, gradually softening into white pustules, which can break on their own, with a diameter of 3-5mm; 10-12 weeks, scabs will start to form, leaving a small, slightly red scar after the scabs fall off, and later The red color gradually turns into skin color. How to take care of the pus after BCG vaccination? If there are local pus blisters or ulcers after BCG vaccination, there is no need to rub or bandage them. However, the area should be kept clean, and clothes should not be worn too tightly. If pus flows out, sterile gauze or cotton can be used to wipe it away, and do not squeeze it. After vaccination, the lymph glands in the ipsilateral armpit may occasionally become slightly swollen, but it does not matter, it will disappear on its own. The swollen lymph glands are usually found in the left axilla, but occasionally in the subclavian area or the neck; the swollen, mobile lymph glands can usually be palpated under the skin at the site of occurrence; if they have become septic, they are attached to the skin and sometimes there are localized white spots of septic. The main reason for the occurrence of swollen lymph glands is related to the individual’s constitution, and the younger the age of vaccination, the more likely it is to occur, and also to the type of vaccination or vaccination that is too deep, such as vaccination under the skin.