The precautions to be taken after having received MMR vaccine include keeping the injection site clean, avoiding scratching, any allergy, any fever and so on. 1. Keep the injection site clean and avoid scratching: avoid bathing within 24 hours of vaccination, avoid contamination of the needle opening, do not scratch with hands and rub with clothes to prevent infection. 2. Allergy: Some patients are allergic to the vaccine and may have a generalized rash and difficulty in breathing, etc. If this occurs and gets worse gradually, please inform the doctor in time and deal with it accordingly. 3. Fever: after vaccination, some people have body defense and fever, if the body temperature is greater than 38.5℃, you need to go to the hospital in time, less than 38.5℃ can be temporarily observed. After vaccination, we must follow the doctor’s advice to pay attention to the relevant precautions, discomfort and timely medical attention.