Nurse confirmed the patient involved has not reported any medical concerns or symptoms after being administered the expired dose of PROQUAD.; Nurse calling with a report of an adverse event regarding an expired dose of PROQUAD that was administered to a patient. Nurse stated that the dose of PROQUAD had a labeled expiration date of 1/6/2025 and was administered to the patient on 1/20/2025; This spontaneous report was received from a registered nurse, referring to a patient of unknown age and gender. The patient’s medical history, concurrent conditions and concomitant therapies were not reported. On 20-JAN-2025, an expired dose of measles, mumps, rubella and varicella (oka-merck) virus vaccine live (recombinant Human albumin [rHA]) (PROQUAD) injection, 0.5 ml / two dose series, lot #X018729, expiration date: 06-JAN-2025 (administered for prophylaxis, strength, and route of administration were not provided) was administered to the patient (Expired product administered). Operator of device was health professional. Nurse confirmed the patient involved had not reported any medical concerns or symptoms after being administered the expired dose of measles, mumps, rubella and varicella (oka-merck) virus vaccine live (rHA) (PROQUAD) (No adverse event). No additional information provided.