Transient fever may occur after MMR vaccination, usually within 1-2 weeks. Due to individual differences, a transient febrile reaction may occur, usually within 1-2 weeks after vaccination. For mild febrile reactions, the body temperature of about 38.5°C usually lasts for 1-2 days and resolves on its own without treatment, or only physical cooling such as ice packs is given. For moderate febrile reactions, body temperature greater than 38.5 ° C or fever for more than 48 hours, oral ibuprofen and other medications as prescribed by the doctor can be used for symptomatic treatment. Adverse reactions such as pain at the injection site, rash, and mild parotid gland enlargement may occur after injection. Family and personal history of convulsions, chronic illness, history of epilepsy, allergies, breastfeeding women, should be used with caution and consult the vaccination site physician for advice. The use of this vaccine is contraindicated in people who are allergic to this drug or the components of the formula, gentamicin sulfate, women during pregnancy, with encephalopathy, uncontrolled epilepsy. For patients who develop fever, they should rest, drink plenty of boiled water and keep warm to prevent secondary infections.