Before vaccination, you need to consult your doctor to understand the contraindications to vaccination, vaccination time, cost, etc., to determine whether it is suitable for vaccination. 1. Contraindications to vaccination: In general, if there are certain diseases, such as infection, fever, diarrhea, active tuberculosis, immune deficiency, pregnancy or breastfeeding, as well as patients with acute and chronic illnesses, it is usually not suitable for vaccination. 2. Vaccination time: pay attention to the vaccination time interval, usually some vaccines may need multiple vaccinations, each other need to be a certain time interval to be vaccinated, at the same time, different vaccination, also need to be a certain time interval. For example, the new crown vaccine can not be vaccinated at the same time with the flu vaccine, HPV vaccine, etc., and the polio vaccine can not be vaccinated at the same time with BCG vaccine and DPT vaccine. 3. Cost: At present, many vaccines are free of charge, but some vaccines are self-funded, such as 13-valent pneumonia vaccine, chickenpox vaccine, influenza vaccine, hand-foot-mouth disease vaccine, oral rotavirus vaccine, etc. It is recommended to consult a preventive doctor before vaccination. It is recommended that you consult a doctor at a preventive healthcare facility before getting vaccinated.