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medication error due to administration of vaccine that was reconstituted with wrong diluent with no reported adverse event; Initial information received on 08-Dec-2022 regarding an unsolicited valid non-serious case received from a nurse. This case is linked to cases 2022SA489108, 2022SA502558 and 2022SA503839. This case involves a 14-year-old male patient who had medication error due to administration of vaccine that was reconstituted with wrong diluent with no reported adverse event with yellow fever vaccine [YF-VAX]. The patient's past medical history, medical treatment(s), vaccination(s) and family history were not provided. Concomitant medications included typhoid vaccine (Typhoid) and diphtheria vaccine toxoid, pertussis vaccine acellular 5-component, tetanus vaccine toxoid (ADACEL) both for Prophylactic vaccination. On 20-Oct-2022, the patient received suspect yellow fever vaccine at a dose of 0.5 ml total (lot UJ412AB, expiry date: 22-Nov-2025) via subcutaneous route in the left arm for immunization. On 20-Oct-2022 the patient had a non-serious medication error due to administration of vaccine that was reconstituted with wrong diluent with no reported adverse event (product preparation error, latency: same day). Action taken: Not applicable. Outcome: Unknown. This suspected adverse reaction report is submitted and classified as a medication error solely and exclusively to ensure the marketing authorization holder's compliance with the requirements set out in the Directive 2001/83/EC and Module VI of the Good Pharmacovigilance Practices. The classification as a medical error is in no way intended, nor should it be interpreted or construed as an allegation or claim made by the marketing authorization holder that any third party has contributed to or is to be held liable for the occurrence of this medication error.