Precautions after varicella vaccination include understanding its adverse reactions, and staying after vaccination, protection of the vaccination site and so on. 1. Adverse reactions: including mild fever reaction, transient rash, and severe allergic reaction in severe cases. 2. Staying for observation: after chickenpox vaccination, severe allergic reaction can occur in a short time, even causing anaphylactic shock. Staying for half an hour to one hour can get timely rescue when serious allergic reaction occurs. 3. Protection of the vaccination site: After vaccination, the injection site may have pain or tenderness and other discomforts, which should be protected by avoiding scratching and so on. If there is any doubt or discomfort, it is recommended to seek medical advice and consultation in time.