no feeling in the legs; fell; interchange of vaccine; no appetite; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 69-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 10Mar2023 as dose 3 (booster), single (Lot number: 6L2042) at the age of 69 years, in left arm for covid-19 immunisation.The patient's relevant medical history included: "Narcolepsy" (unspecified if ongoing); "Neuropathy" (unspecified if ongoing), notes: It is in both feet and partially up both legs; "Stent placement", start date: Aug2022 (unspecified if ongoing); "Diabetes Type 1" (unspecified if ongoing), notes: Diabetes Type 1 Has had this diagnosis for 55 years. There were no concomitant medications. Vaccination history included: Janssen covid-19 vaccine (Dose: 01, Lot:1808980), administration date: Apr2021, when the patient was 67 years old, for COVID-19 Immunization; Moderna covid-19 vaccine (Dose: 02, Lot:022C21A), administration date: Nov2021, when the patient was 67 years old, for COVID-19 Immunization. The following information was reported: INTERCHANGE OF VACCINE PRODUCTS (hospitalization) with onset 10Mar2023, outcome "unknown", described as "interchange of vaccine"; FALL (hospitalization) with onset 11Mar2023, outcome "unknown", described as "fell"; DECREASED APPETITE (non-serious) with onset 11Mar2023, outcome "recovering", described as "no appetite"; ANAESTHESIA (hospitalization) with onset 11Mar2023, outcome "recovered" (13Mar2023), described as "no feeling in the legs". The patient was hospitalized for interchange of vaccine products, anaesthesia, fall (start date: 11Mar2023, discharge date: 13Mar2023, hospitalization duration: 3 day(s)). The patient underwent the following laboratory tests and procedures: CTC: (Mar2023) Both came back clear, notes: they did something called a CTC, and an MRI, Both came back clear; (Mar2023) Unknown results, notes: When he was in the hospital they ran all kinds of test; Magnetic resonance imaging: (Mar2023) Clear, notes: Result: Clear; Unit: Not Provided.  Clinical course : Caller states that he got the Pfizer shot for COVID, he cant read what the guys wrote here but it is the Bivalent Vaccine, he got that one the 10th, he was fine when he went home but the next day he had no feeling in the legs, so his girlfriend was helping him around the condo and to get into a recliner. He also noticed that he didnt have an appetite either, after his girlfriend fixed him dinner he noticed that he could only eat half, he couldnt finish that, and when he went to get up from the table, his legs gave out and he fell. His Girlfriend called Withheld, the emergency squad came, he spent the next 3 days in the hospital, he was admitted. He figured Pfizer would want to know this. He clarified that on 10Mar2023 he got the Pfizer Bivalent COVID vaccine. Having no feeling in the legs started on 11Mar2023. On 11Mar2023 he went to the hospital. No feeling in the legs: He now has got feeling back in his legs, it came back on 13Mar2023, he is walking around fine, He was discharged from the hospital on Monday 13Mar2023. No appetite: The no appetite started the day after the vaccination on 11Mar2023, his appetite has returned and he has got it back but it is not as strong.