Before, during and after the third vaccination, there are corresponding precautions, which are for reference only. 1. Before vaccination: you should know the type of vaccine, the appropriate vaccination population, contraindications for vaccination, etc. Those who are allergic to the vaccine components cannot be vaccinated, and the vaccination should be postponed during the period of illness. 2. During the vaccination: carry the vaccination certificate, ID card, etc., and do a good job of personal protection. 3. After vaccination: stay for 30 minutes, no serious adverse reactions before leaving. Avoid bathing within 24 hours after vaccination, avoid eating too spicy and stimulating, and drink as little alcohol as possible. If the local redness, swelling, pain, generalized weakness, low fever and other common adverse reactions are normal phenomena, usually 2-3 days will be relieved. If the symptoms are serious and can not be relieved, it is recommended to go to the hospital in time for consultation and treatment.