interchange of vaccine products; Flu shot: Got it yesterday, 26Oct2022, with Covid-19 Vaccine Booster; Flu shot: Got it yesterday, 26Oct2022, with Covid-19 Vaccine Booster; really bad chills; extremely sore arm; she is a little weak; weak arms; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 72-year-old female patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 26Oct2022 at 15:00 as dose number unknown (booster), single (Batch/Lot number: unknown) at the age of 72 years, in left arm for covid-19 immunisation; influenza vaccine (INFLUENZA VACCIN), on 26Oct2022 as dose number unknown, single (Batch/Lot number: unknown), in right arm for immunisation. The patient's relevant medical history was not reported. There were no concomitant medications. Vaccination history included: coviD-19 vaccine moderna (DOSE 1, SINGLE, Lot no: 032L2OA), administration date: 27Jan2021, when the patient was 70-year-old, for COVID-19 Immunization; coviD-19 vaccine moderna (DOSE 2, SINGLE, Lot no: 024M2OA), administration date: 24Feb2021, when the patient was 70-year-old, for COVID-19 Immunization, reaction(s): "sore arm"; BNT162b2 (DOSE 3 (Booster), SINGLE, Lot no: F31620, Anatomical location: Right arm), administration date: 29Nov2021, when the patient was 71-year-old, for COVID-19 Immunization. The following information was reported: PAIN IN EXTREMITY (non-serious) with onset Oct2022, outcome "recovering", described as "extremely sore arm"; ASTHENIA (non-serious) with onset Oct2022, outcome "unknown", described as "she is a little weak"; MUSCULAR WEAKNESS (non-serious) with onset Oct2022, outcome "unknown", described as "weak arms"; OFF LABEL USE (non-serious), PRODUCT USE ISSUE (non-serious) all with onset 26Oct2022, outcome "unknown" and all described as "Flu shot: Got it yesterday, 26Oct2022, with Covid-19 Vaccine Booster"; CHILLS (non-serious) with onset 26Oct2022, outcome "recovered", described as "really bad chills"; INTERCHANGE OF VACCINE PRODUCTS (non-serious) with onset 26Oct2022 at 15:00, outcome "unknown". Therapeutic measures were not taken as a result of chills, asthenia, muscular weakness. Therapeutic measures were taken as a result of pain in extremity.  Additional information: Patient got her shot yesterday, the Covid-19 vaccine booster, and wanted to bring something up. The other time her arm was sore but this time it is extremely sore. They gave her flu shot too so she has two really sore arms. She had really bad chills. Many years ago she was a respiratory therapist. That was in the past. Patient had Really bad chills. started later in the evening. She got the shot at 3:00PM and chills started around 9PM or 10PM on 26Oct2022. Today the chills have resolved but now she is a little weak. She was getting blankets and moving from couch to something else. It was cold and she had a sweater, but she couldn't put it over her head because it hurt to lift arm up, so she just had her hands in sweater. Patient had Extremely sore arm. it might have started before the chills. It might sound weird, but she could hardly walk because her arms were weak. She is elderly. She had weak arms and she pushes up with her arms. She was having some trouble moving around. Her arm is still slightly sore. She used an ice pack. Clarified that she thinks she had sore arm previously with her second Covid19 vaccine. Icing it helped a lot with the other times. Patient did not received any treatment and she has not had to go to ER or to physician's office. She doesn't get chills often. Patient did not received any Prior Vaccinations within 4 weeks. Patient had no medical history.  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.