it is her multiple sclerosis diagnosis what's causing these symptoms; she hasn't been able to walk or stand for more than 30 seconds; she hasn't been able to walk or stand for more than 30 seconds; 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 80-year-old female patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), in Oct2022 as dose number unknown (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history included: "SARS" (unspecified if ongoing), notes: She also had SARS four years ago while staying in the hospital; "Multiple Sclerosis" (unspecified if ongoing), notes: 36 when diagnosed with Multiple Sclerosis; "Knee replacement" (unspecified if ongoing), notes: long time ago; "lost eyesight" (unspecified if ongoing), notes: lost eyesight, Multiple sclerosis 17 years old when she lost eyesight and 36 when diagnosed with Multiple Sclerosis; "Hip replacement" (unspecified if ongoing), notes: Hip replacement Left hip was replaced long time ago; Right hip was not replaced. There were no concomitant medications. Vaccination history included: Covid-19 vaccine (Primary Immunization series complete; unknown manufacturer), for COVID-19 immunization. The following information was reported: MULTIPLE SCLEROSIS (medically significant) with onset Oct2022, outcome "unknown", described as "it is her multiple sclerosis diagnosis what's causing these symptoms"; GAIT DISTURBANCE (non-serious), DYSSTASIA (non-serious) all with onset Oct2022, outcome "unknown" and all described as "she hasn't been able to walk or stand for more than 30 seconds". Therapeutic measures were taken as a result of multiple sclerosis, gait disturbance, dysstasia.  Clinical course: It was reported that the patient stated that after getting the booster dose she has not been able to walk or stand for more than 30 seconds. The caller states her doctors have told her that it was her multiple sclerosis diagnosis what's causing these symptoms. She also had SARS four years ago while staying in the hospital. Doctors also mentioned that it may be another disease from the shot, but she cannot recall the name. the caller requests information on what she is experiencing. The patient wanted to know what was going on. Prior to the booster, she was walking, 80 steps or so. Can't walk, can't stand for more than 30 seconds: Began almost immediately, but she disregarded it. She had Multiple Sclerosis. She decided to let her see what she could do, but it hasn't come back. Treatment was just physical therapy. She does not have her COVID-19 Vaccine record card to provide product information and NDCs/LOTs/EXPs for the booster or her previous COVID-19 Vaccines at time of call. States she was in an assisted living prior and doesn't have a card, but they should have it on file. She received her COVID-19 Vaccine booster in Oct2022. Confirms her booster was manufactured by Pfizer Investigations were Stated that they are going to blame it on Multiple Sclerosis, which could be part of it, but she was walking with Physical Therapy. Her physical therapy lady got the booster too. No further details provided.  The information on the batch/lot number for BNT162b2, BNT162b2 omi ba.4-5 has been requested and will be submitted if and when received.