For 36 hours following the covid booster I was ill with flu-like symptoms; For 36 hours following the covid booster I was ill with flu-like symptoms; The first 24 hours included a fever of 99.1 to 99.3; Joint aches; Chills; Bad sweating (I sweated through 5 changes of PJs); Headache; Tiredness; Dose received: 3; This is a spontaneous report from a contactable reporter (consumer or other non HCP). The reporter is the patient.   A 62-year-old male patient received bnt162b2 (BNT162B2), administered in left arm, administration date 01Dec2021 at 09:30 (Lot number: EW0217) at the age of 62 years as dose 3 (booster), single for COVID-19 immunisation. Relevant medical history included: "Restless leg syndrome" (unspecified if ongoing), notes: RLS and "Atrial fibrillation" (unspecified if ongoing), notes: a-fib. Concomitant medications were not reported. Other vaccines received within four weeks included: FLU VACCINE taken for Immunisation, start date: an unknown date in Nov2021, stop date: an unknown date in Nov2021. Vaccination history included: Bnt162b2 (DOSE 2, SINGLE, Lot number: EW0162, Anatomical location: Left arm, Administration time: 15:00), administration date: 13Apr2021, when the patient was 61 years old, and Bnt162b2 (DOSE 1, SINGLE, Lot number: ER8727, Anatomical location: Left arm, Administration time: 15:30), administration date: 23Mar2021, when the patient was 61 years old, for COVID-19 immunisation.  The following information was reported: IMMUNISATION (non-serious) with onset 01Dec2021 at 09:30, outcome "unknown", described as "Dose received: 3"; MALAISE (non-serious) with onset 01Dec2021 at 16:00, outcome "recovered" (03Dec2021 at 04:00), described as "For 36 hours following the covid booster I was ill with flu-like symptoms"; INFLUENZA LIKE ILLNESS (non-serious) with onset 01Dec2021 at 16:00, outcome "recovered" (03Dec2021 at 04:00), described as "For 36 hours following the covid booster I was ill with flu-like symptoms"; PYREXIA (non-serious) with onset 01Dec2021 at 16:00, outcome "recovered" (03Dec2021 at 04:00), described as "The first 24 hours included a fever of 99.1 to 99.3"; ARTHRALGIA (non-serious) with onset 01Dec2021 at 16:00, outcome "recovered" (03Dec2021 at 04:00), described as "Joint aches"; CHILLS (non-serious) with onset 01Dec2021 at 16:00, outcome "recovered" (03Dec2021 at 04:00), described as "Chills"; HYPERHIDROSIS (non-serious) with onset 01Dec2021 at 16:00, outcome "recovered" (03Dec2021 at 04:00), described as "Bad sweating (I sweated through 5 changes of PJs)"; HEADACHE (non-serious) with onset 01Dec2021 at 16:00, outcome "recovered" (03Dec2021 at 04:00), described as "Headache"; FATIGUE (non-serious) with onset 01Dec2021 at 16:00, outcome "recovered" (03Dec2021 at 04:00), described as "Tiredness". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of malaise, influenza like illness, pyrexia, arthralgia, chills, hyperhidrosis, headache and fatigue.  Additional information: It was reported that the last 12 hours, the fever, chills and sweating had abated, just headache and tiredness. The anatomical location for flu vaccine was reported as left shoulder. The patient had no known allergies. Prior to vaccination, the patient was not diagnosed with COVID-19. Since the vaccination, the patient had not been tested for COVID-19. The events did not result in doctor or other healthcare professional office/clinic visit and emergency room/department or urgent care.