patient had their pre-exposure in 1999 but the patient only had 1 dose with no reported adverse event; Initial information received on 24-Jan-2025 regarding an unsolicited valid non-serious case received from a other health professional. This case involves an unknown age female patient who had her pre-exposure in 1999 but the patient only had 1 dose of rabies (HDC) vaccine [Imovax Rabies] with no reported adverse event . The patient’s past medical history, medical treatment(s), vaccination(s) and family history were not provided. On an unknown date, the patient had their pre-exposure in 1999 but the patient only had 1 dose with an unknown dose of rabies (HDC) vaccine Powder and solvent for suspension for injection (strength, expiry date and lot number not reported) via unknown route in unknown administration site as Immunization with no reported adverse event (routine immunisation schedule incomplete) (unknown latency). Information on the batch number was requested corresponding to the one at time of event occurrence. Reportedly, patient received the vaccine from a different brand which the she could not remember. Patient told the specialist that her titers dropped and she would need a booster so she was asking on the number of shots that she should receive for the booster dose of Rabavert 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.