febrile seizures; fatigue; drowsiness; chill; feeling unwell; fever; This spontaneous report was received from consumer and referred to an 8-year-old male patient. The patient’s medical history was not reported. The patient’s concurrent condition was not reported. Concomitant therapies were not reported. On 09-JUL-2024, the patient was vaccinated with measles, mumps, and rubella (wistar ra 27-3) virus vaccine, live (M-M-RVAXPRO) subcutaneous injection, 0.5 milliliter, lot #X007521, expiration date: 28-FEB-2025, administered for prophylaxis (strength, and route of administration were not provided); and diphtheria vaccine toxoid, polio vaccine inact 3v (vero), tetanus vaccine toxoid (REVAXIS) suspension for injection, 0.5 milliliter, lot # W3H052V, administered for prophylaxis (strength, expiry date, and route of administration were not provided). On the same day, the patient experienced febrile seizures, fatigue, drowsiness, chill, feeling unwell and fever with body temperature 38 to 40.5 degrees Celsius. At the time of reporting, the patient was recovering from the events of febrile seizures, chill and feeling unwell. At the time of reporting, the patient had not recovered from the events of fatigue, drowsiness or fever. The causal relationship between the events and measles, mumps, and rubella (wistar ra 27-3) virus vaccine, live (M-M-RVAXPRO) was unknown.