If the body temperature is 37.5℃ one week after MMR vaccination, it is recommended to take into account the specific condition and give appropriate treatment. A temperature of 37.5℃ one week after MMR vaccination may be an adverse reaction caused by the vaccine, or it may be a fever caused by other factors, which is not related to the vaccine. In general, for vaccine-induced hypothermia, it is recommended to drink plenty of fluids as appropriate, and when discomfort persists, ibuprofen and acetaminophen can be considered to reduce fever. Because it has been injected for a week, we should also consider other causes of fever, such as viral or bacterial infections, etc. It is recommended to go to the fever clinic of the hospital to improve the inflammation index, the new coronavirus nucleic acid test to clarify the cause of fever. Then treatment will be given. Post-vaccine fever should go to a specialized hospital to improve the relevant examinations and be treated under the guidance of a doctor.