High fever; chills like she never had before; Nausea; headache; malaise; she did not feel good; she could hardly get out of the bed; Booster; This is a spontaneous report from a contactable consumer (patient). A 81-year-old female patient received third dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, solution for injection, Batch/Lot number: Not Reported, Expiry Date: Not Reported), via an unspecified route of administration on 28Sep2021 as dose 3 (booster), single (age at vaccination: 81 years) for covid-19 immunisation. The patient medical history and concomitant medications were not reported. The patient previously took first and second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, solution for injection, Batch/Lot number: Not Reported, Expiry Date: Not Reported), via an unspecified route of administration on an unspecified date in Jan2021 and Feb2021 as dose 1, single and dose 2, single respectively both doses for covid-19 immunisation and had no reaction form first dose and experienced mild reaction with second dose. The patient also took flu shot on an unspecified date in 2021 (the patient had her seasonal flu shot a couple weeks before) for immunisation. On 28Sep2021, booster was administered. On 29Sep2021, the patient experienced high fever, chills, malaise, nausea, and headache. On 30Sep2021 the patient was feeling better. The patient stated had malaise the day after and she did not feel good. The patient had her seasonal flu shot a couple weeks before, and the patient read on the FDA website that you can get both shots at the same time. As per DSU agent, patient wanted to know if these are common effects with the booster shot. However, after the transfer, patient stated she was only calling to report her reaction with the booster shot and is not inquiring. The patient questioned whether she could get booster shots of the Pfizer COVID-19 vaccine) in the future. The patient confirmed the details provided by the transferring agent but stated she received the booster Covid 19 vaccine on Tuesday, 28Sep2021. She reports she was ok that day, 30Sep2021. The day before, 29Sep2021, she had fever, chills like she's never had before, malaise and she could hardly get out of the bed. She took Tylenol and she tried to keep herself hydrated. She states she did not have any life-threatening symptoms at all, and this was her booster Covid 19 vaccine. She wants to know if this is common with the booster vaccine. She was just primarily calling, not with a complaint, she was surprised with her reactions to the vaccine. She had her first 2 Covid 19 vaccines in Jan2021 and the second one in Feb2021. She received her Covid 19 booster vaccine at a pharmacy and she is surprised she had this reaction. She will probably talk to her doctor but probably would not get another Covid 19 booster vaccine. She declines to file a safety report. No further information is provided or obtained. The reporter assessed the seriousness of the case as non-serious. The patient underwent lab tests and procedures which included fever: high on 29Sep2021. The patient received treatment for all the reported events. Outcome of the event was recovering.  No follow-up attempts are needed; information about lot/batch number cannot be obtained.