Diagnosed with flu; Tested positive for the flu on Sunday 19-Jan-2025/ received a Flucelvax vaccine on 29-Oct-2024; Fever; Aches and pains; Fatigue; This spontaneous case, initially received on 21-Jan-2025, was reported by a non health professional and concerns a male patient of unknown age. Concomitant Medications: Unknown Medical History: Unknown Administration of company suspect drug: On 29-Oct-2024, the patient received Flucelvax (TIV) for an indication not reported, Dose regimen: 0.5 ml, route of administration and anatomical location: not reported. Lot number: not reported but will be requested upon follow-up. No additional suspect drugs. Adverse reactions/events and outcomes: On 19-Jan-2025, the patient experienced Tested positive for the flu on Sunday 19-Jan-2025/ received a Flucelvax vaccine on 29-Oct-2024 (Medically Significant, outcome: Unknown). On 19-Jan-2025, the patient experienced Diagnosed with flu (Medically Significant, outcome: Unknown). Associated symptoms included: Fever, Aches and pains, Fatigue. The patient reported that had tested positive for the flu on Sunday 19-Jan-2025. He received a Flucelvax vaccine on 29-Oct-2024. Side effects he had had were fever, aches and pains and fatigue. Patient reported that he was diagnosed with flu (influenza) after taking Flucelvax. Flucelvax (TIV) action taken: Not Applicable Reporter assessment: The reporter considered the events as non serious and did not provide a causality assessment.; Reporter’s Comments: Causality: Due to the spontaneous nature of the case, it is considered related for reporting purposes. A lack of effect can generally be expected for any medicinal/drug product as a 100% success rate cannot be reasonably assumed in every patient treated.