one of them only received the DTaP-IPV part and not the whole component; Initial information received on 23-Dec-2024 regarding an unsolicited valid non-serious case received from a other health professional. This case involves, a 6 months old female patient who received Diphtheria/Tetanus/5 Hybrid Ac Pertussis/IPV(Vero)/HIB (Prp/T) Vaccine [Pentacel (Vero)] and one of them only received the DTAP-IPV part and not the whole component. The patient’s past medical history, medical treatment(s), vaccination(s) and family history were not provided. Concomitant medications included Hepatitis B Vaccine; Pneumococcal Vaccine Conj 20v (Crm197) (Prevnar 20) and Rotavirus Vaccine Live Reassort Oral 5v (Rotateq) for Immunisation. On 22-Nov-2024, the patient received 0.5 ml (Standard) (1 X-once) dose of suspect Diphtheria/Tetanus/5 Hybrid Ac Pertussis/IPV(Vero)/HIB (Prp/T) Vaccine Suspension for injection (lot UK041AA, 31-Aug-2025) via intramuscular route in the right thigh and one of them only received the DTAP-IPV part and not the whole component (single component of a two-component product administered) (latency- same day). Reportedly, HCP said that in Nov-2024, they had 2 patients that were given PENTACEL. They don’t know which child only received the liquid component so they are asking if they need to revaccinate the 2 children. Infant is currently 7 months old but was 6 months old when she received PENTACEL 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.