BCG vaccination is very safe and reliable. This is a well-known reason, but Bai Mi will have a sparse period, because each baby''s body is different, so the reaction after vaccination will be different, of course. It does not rule out the occurrence of some adverse reactions, so what are the adverse reactions after BCG vaccination?

　　 Any vaccine may produce some uncomfortable reactions after vaccination, this is because although the pathogenic ingredients have been attenuated and killed Treatment, but there will still be certain toxicity, and some allergic reactions and adverse reactions may still occur. We call it general adverse reactions, which is a normal phenomenon.

　　There are two kinds of local reaction and lymph node reaction after BCG vaccination.

　　 (1) Local reaction: Inoculation by intradermal method or skin scratch method, local swelling and induration may appear in about 3 weeks, and the middle gradually softens to form small white pustules and pustules She wears the scab on her own, leaving a small scar behind the scab. Its local reaction generally lasts about 2 months.

　　 (2) Lymph node reaction: After BCG vaccination, the vaccine can reach the whole body through the lymphatic system, so the lymph nodes near the vaccination site can be slightly swollen, such as the armpits, clavicle up and down or neck, if Abscess or ulceration can be seen strongly in response. Seek medical attention promptly.

　　The contraindications for BCG vaccination are:

　　①Newborns have fever, diarrhea, vomiting; premature delivery, dystocia have birth injuries; those with pustules Vaccination is not suitable for sores and eczema.

　　②Children with fever, above 37.5°C; all kinds of acute infectious diseases and recovery within 2 months; severe heart, kidney, liver diseases; skin diseases, allergic asthma, urticaria or Those who have allergic reactions to vaccinations; those who are less than two weeks away from other vaccinations (except for vaccinia, but stagger the vaccination site).

　　To test whether the BCG vaccine is successfully inoculated, the tuberculin test should be conducted 2 to 3 months after the BCG vaccine is inoculated. If it changes from negative to positive, it means that the vaccination is successful. After BCG vaccination, the immunity can be maintained for several years, and the immunity can be weakened over time, so it needs to be replanted.