sick for 2-3 weeks after getting each vaccine; chills; fever; cant do anything; low white cell count "lower end of the normal"; suppressed autoimmune system; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  An 83-year-old female patient received BNT162b2 (BNT162B2), on 07May2022 as dose 4 (booster), single (Batch/Lot number: unknown) at the age of 83 years for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2 (DOSE 1, SINGLE , Lot number: EN6206, Vaccination Anatomical site: Left arm), for COVID-19 Immunization, reaction(s): "Chills", "Tiredness", "just did not feel her self", "headache", "suppressed autoimmune system", "low white cell count "lower end of the normal"; Bnt162b2 (DOSE 2, SINGLE , Lot number: EN6205, Vaccination Anatomical site: Left arm), for COVID-19 Immunization, reaction(s): "chills", "sick for 2-3 weeks after getting each vaccine", "suppressed autoimmune system", "cant do anything", "fever", "low white cell count "lower end of the normal"; Bnt162b2 (DOSE 3 (BOOSTER), SINGLE), for COVID-19 Immunization, reaction(s): "chills", "sick for 2-3 weeks after getting each vaccine", "suppressed autoimmune system", "cant do anything", "Fever", "low white cell count "lower end of the normal". The following information was reported: LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (non-serious) with onset May2022, outcome "unknown", described as "cant do anything"; CHILLS (non-serious) with onset May2022, outcome "unknown"; PYREXIA (non-serious) with onset May2022, outcome "unknown", described as "fever"; WHITE BLOOD CELL COUNT DECREASED (non-serious) with onset May2022, outcome "unknown", described as "low white cell count "lower end of the normal""; ILLNESS (non-serious) with onset May2022, outcome "unknown", described as "sick for 2-3 weeks after getting each vaccine"; IMMUNE SYSTEM DISORDER (non-serious) with onset May2022, outcome "unknown", described as "suppressed autoimmune system". Relevant laboratory tests and procedures are available in the appropriate section.  Additional Information: It was reported that, this report is not related to study or program. Caller received 2 primary series of Pfizer covid vaccine and 2 boosters shot. last one on 07May2022. she stated she had gotten sick for 2-3 weeks after getting each vaccine; chills, fever, can not do anything, no ER visits. After the second booster patient was without a problem but then she was sick again 2 weeks after. But with her you know emergency care told me just drinking water. So her question is as far as she have been waiting for next booster, so her question is if it would be helpful if she take another next booster earlier than 6 month, later she mean she could take like when it would make a different for her. She would built up a better immunity. Caller wanted to know how much immunity she had after being sick with each vaccination. When paraphrased the concern, consumer stated, Expecting the 6th each time she did not whether that means build up any kind of immunity or not. She was very conscious about what to do. She did not go to the buildings. She had very restricted life. She wears mask all the time. She was feeling good, but she wanted to know how to build up immunity how it was possible. Consumer was informed about the role of Pfizer Drug Safety and Pfizer Medical Information for the concern. When probed for event start date, consumer stated, it was a year ago that she told. When probed for vaccination Facility details, consumer stated, she got them on two different places. The last place she got at capital region Pharmacy services, but she did not have the address or phone. She believes they were colony. When probed for any other medical condition and any concomitant medications, consumer stated, she did not want to go into in her all med. As consumer was not willing to proceed the call and abruptly hung up. Hence further probing could not be done. Limited information was available over the call.  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.