According to Article 11 of Chapter 2 of the Law of the People’s Republic of China on the Prevention and Control of Infectious Diseases: The State implements a planned system of preventive vaccination. Any person in the People’s Republic of China shall receive vaccination in accordance with the relevant provisions. At present, the vaccines for which children of school age are immunized under the program in China (which may vary slightly from province to province) are: polio vaccine, measles vaccine, BCG vaccine, adsorbed diphtheria vaccine (i.e., a mixture of pertussis vaccine, diphtheria toxoid, tetanus toxoid) and adsorbed diphtheria-tetanus combination vaccine, hepatitis B vaccine, group A influenza vaccine, and brain B vaccine. In addition, many provincial health departments have approved the promotion of the use of non-scheduled immunization vaccines, which currently include typhoid Vi polysaccharide vaccine, adsorbed acellular pertussis diphtheria-tetanus combination vaccine, live attenuated rubella vaccine, live attenuated measles-rubella-mumps triple vaccine, live inactivated and attenuated hepatitis A vaccine, live bivalent oral vaccine for F. sonnei dysentery, bivalent inactivated vaccine for renal syndrome hemorrhagic fever, purified rabies vaccine for human use vaccine, influenza vaccine, live attenuated varicella vaccine, 23-valent pneumococcal polysaccharide vaccine, Haemophilus influenzae type b vaccine, A+C bivalent meningitis polysaccharide vaccine. Sometimes, due to the need of epidemic, the local disease control department will organize a booster vaccination for certain groups of people for certain infectious diseases, and parents should cooperate. Vaccination can improve the immunity of the body and prevent the corresponding infectious diseases. However, vaccines are similar to clinically used drugs, and some normal reactions and side reactions occur in very few people while obtaining immune protection, such as fever, local pain, and scattered rash after vaccination; some vaccines also have special reactions after vaccination, for example, about 2 weeks after BCG vaccination, local redness and swelling infiltrate, followed by pus, forming small ulcers, generally crusting in 8-12 weeks, without special treatment. A very small number of children may have swollen local lymph nodes in the armpit after vaccination, which requires timely treatment; a small number of people may have local redness, swelling and hard nodes after BCG vaccination. Children with allergies may also have local or systemic allergic reactions after receiving some vaccines. In addition, there are children with diseases that cannot be vaccinated or are temporarily unsuitable for vaccination. Parents and guardians of children are requested to report the relevant information to the vaccination unit before vaccination.