administering an expired Engerix-B vaccine to a patient; This non-serious case was reported by a other health professional via call center representative and described the occurrence of expired vaccine used in a 15-day-old female patient who received HBV (Engerix B pediatric) (batch number 9PG49, expiry date 28-DEC-2024) for prophylaxis. On 03-JAN-2025, the patient received Engerix B pediatric. On 03-JAN-2025, an unknown time after receiving Engerix B pediatric, the patient experienced expired vaccine used (Verbatim: administering an expired Engerix-B vaccine to a patient). The outcome of the expired vaccine used was unknown. This report is made by GSK without prejudice and does not imply any admission or liability for the incident or its consequences. Additional Information: GSK Receipt Date: 03-JAN-2025 Reporter requested information and reported adverse events after administering an expired Engerix-B vaccine to a patient on 03-JAN-2025 which led to expired vaccine used.