There is no authoritative information on how many days the MMR usually burns, and the fever usually lasts 1~4 days. MMR generally refers to three kinds of diseases such as measles, mumps and rubella, which are mainly caused by measles virus, parotid virus and other pathogens infections such as measles, mumps and rubella, in addition to fever, the patient will also have cough, parotid gland enlargement, sore throat, sneezing and other symptoms, the patient should take timely treatment measures. There is no specific clinical information on the duration of fever in patients with measles and mumps, most patients will last for 1~4 days, patients with milder symptoms usually have fever for 1 day, if the patient’s symptoms are more serious, the fever may last for 4 days or even longer, and it is recommended to seek medical treatment in time. Measles, mumps, rubella patients with fever symptoms can be prescribed oral acetaminophen tablets, ibuprofen extended-release capsules, indomethacin tablets and other non-steroidal anti-inflammatory drugs to reduce fever, you can also use ribavirin injection and other antiviral drugs. Patients who develop MMR should go to the hospital in time and follow the doctor’s instructions for treatment.