doesn't have appetite; he cannot get in the shower; Has lost 8 pounds; fever; bladder infection; shaking; Her husband has confusion and is not being able to things by himself after receiving the shot; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team.  An 83-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 17Nov2022 as dose 4 (booster), single (Lot number: 633275) at the age of 83 years, in arm for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: BNT162b2 (First Dose of the Pfizer Covid Vaccine,, Lot Number: EL3249.), administration date: 08Jan2021, when the patient was 81-year-old, for Covid-19 immunization; BNT162b2 (Second Dose of the Pfizer Covid Vaccine,,  Lot Number: EN6200.), administration date: 18Feb2021, when the patient was 81-year-old, for Covid-19 immunization; BNT162b2 (Third Dose of the Pfizer Covid Vaccine,, Lot Number: FF2391 or FF2390 per the caller.), administration date: 18Oct2021, when the patient was 81-year-old, for Covid-19 immunization. The following information was reported: CONFUSIONAL STATE (non-serious) with onset 22Nov2022, outcome "not recovered", described as "Her husband has confusion and is not being able to things by himself after receiving the shot"; TREMOR (non-serious) with onset 22Nov2022, outcome "recovered", described as "shaking"; CYSTITIS (non-serious) with onset 23Nov2022, outcome "unknown", described as "bladder infection"; PYREXIA (non-serious) with onset 23Nov2022, outcome "unknown", described as "fever"; DECREASED APPETITE (non-serious), outcome "unknown", described as "doesn't have appetite"; LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (non-serious), outcome "unknown", described as "he cannot get in the shower"; WEIGHT DECREASED (non-serious), outcome "unknown", described as "Has lost 8 pounds". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Caller called on behalf her husband regarding the Pfizer-BioNTech Covid 19 Vaccine booster shot (no formulation specified). Her husband has confusion and was not being able to things by himself after receiving the shot. Her husband doesn't have appetite as well after receiving the vaccine. She wants to know if these have been reported before. Other Conditions was no, Investigations was no, Other Products was no. Caller states that she was calling about the Pfizer Product: Covid Vaccine Booster shot. Caller states that her husband had this vaccine on 11Nov2022 and on 22Nov2022 per the caller, he started shaking. The next day he had a fever, and they took him in and found he had a bladder infection. Caller states that since her husband had the issue with the shaking, he has been very confused. She has to do everything for him. He used to do his own pills and do everything for himself, and now she was having to be his caregiver. States he cannot get in the shower. She asked him to go to the freezer in the basement and he was so confused, he doesn't know what she meant. Caller states that her husband had a CT scan that showed he has not had a stroke. No prior Vaccinations (within 4 weeks).