He was not specific about symptoms other than to say he was bed-ridden the next day.; stated he was not feeling well after Pfizer COVID booster shot the next morning; Chills/Severe chills; Fever; Headache; Booster; Nausea; Aches; stated he was not feeling well after Pfizer COVID booster shot.; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from a sales representative. The reporter is the patient.  A 31 year-old male patient received bnt162b2 (BNT162B2), intramuscular, administered in arm left, administration date 15Dec2021 09:30 (Lot number: FF88839) at the age of 31 years as dose 3  (booster), single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (Prev dose product:  COVID 19 , Prev dose brand: Pfizer, Prev dose brand unknown: False, Prev dose lot number: EL3248, Prev dose lot unknown: False , Prev dose administrator route: Intramuscular, Prev dose administration date: 30Mar2021 , Prev dose administration time: 09:00 AM, Prev dose dose number: 2, Prev dose vaccine location: Right arm), administration date: 30Mar2021, when the patient was 30 years old, for COVID-19 immunization; Bnt162b2 (Prev dose product : COVID 19, Prev dose brand: Pfizer, Prev dose brand unknown: False,  Prev dose lot number : EN6203, Prev dose lot unknown: False, Prev dose administrator route: Intramuscular , Prev dose administration date: 11Mar2021 , Prev dose administration time: 10:30 AM , Prev dose dose number: 1, Prev dose vaccine location Left arm), administration date: 11Mar2021, when the patient was 30 years old, for COVID-19 immunization. The following information was reported: IMMUNISATION (non-serious) with onset 15Dec2021 09:30, outcome "unknown", described as "Booster"; BEDRIDDEN (non-serious) with onset 16Dec2021, outcome "unknown", described as "He was not specific about symptoms other than to say he was bed-ridden the next day."; ILLNESS (non-serious) with onset 16Dec2021, outcome "unknown", described as "stated he was not feeling well after Pfizer COVID booster shot the next morning"; MALAISE (non-serious) with onset Dec2021, outcome "unknown", described as "stated he was not feeling well after Pfizer COVID booster shot."; CHILLS (non-serious) with onset 16Dec2021, outcome "recovered" (2021), described as "Chills/Severe chills"; PYREXIA (non-serious) with onset 16Dec2021, outcome "recovered" (2021), described as "Fever"; PAIN (non-serious) with onset 15Dec2021, outcome "recovered" (2021), described as "Aches"; HEADACHE (non-serious) with onset 16Dec2021, outcome "recovered" (2021), described as "Headache"; NAUSEA (non-serious) with onset 15Dec2021, outcome "recovered" (2021), described as "Nausea". It was unknown if therapeutic measures were taken as a result of chills, pyrexia, headache. Therapeutic measures were not taken as a result of pain, nausea.  Additional information: The patient took no vaccine in four weeks. The patient took no other medications in two weeks. The patient did not have covid prior vaccination. The patient was not tested for covid post vaccination. The patient had no known allergies. No medical history.  No follow-up attempts are possible. No further information is expected.