It was administered "lower than the usual" site compared to his previous shots; A feeling of stiffness and ache in the injection site/arm; A feeling of stiffness and ache in the injection site/arm; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team, Program. The reporter is the patient.  A 50-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 07Oct2022 as dose number unknown (bivalent; booster), single (Batch/Lot number: unknown), in left arm for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Covid-19 vaccine (Primary Immunization series complete; Unknown manufacturer), for COVID-19 Immunization. The following information was reported: PRODUCT ADMINISTERED AT INAPPROPRIATE SITE (non-serious) with onset 07Oct2022, outcome "unknown", described as "It was administered "lower than the usual" site compared to his previous shots"; VACCINATION SITE PAIN (non-serious), MUSCULOSKELETAL STIFFNESS (non-serious) all with onset Oct2022, outcome "unknown" and all described as "A feeling of stiffness and ache in the injection site/arm".  Additional information: The patient stated that he received Pfizer BioNTech COVID-19 Vaccine Bivalent Booster on the day of reporting and noticed that it was administered lower than the usual site compared to his previous shots. Caller stated that it was administered to the side (laterally) and was not on the front (Bicep Muscle) and was concerned that it may result to lack of efficacy. The patient also stated that it was administered on the left arm and stated that he experienced a feeling of stiffness and ache in the injection site/arm. The patient also stated that the vaccine was administered while he was standing up and it was administered parallel to his bicep area. The patient on the line calling about the Pfizer Bivalent COVID vaccine and just recently got the vaccine and was calling to report the way the pharmacy administered the vaccine was way too low and usually whenever he gets a vaccine it was being administered higher and the administrator did not hit his muscle; asking if that affects the efficacy of the vaccine. Caller verified the information provided and clarified he does not know as he was very thin so normally usually he got them closer up to the shoulder in the deltoid muscle and this was just very low in the muscle so he was a little paranoid and wants to make sure they did hit the muscle. The patient was a very skinny guy so if the patient flexes and put his hand on it, it feels like muscle there but he was concerned if for some reason they did not hit that and it was not muscle does this affect the efficacy of the vaccine. Does not want this to be a part of anything and just wants to find out; obviously the patient cannot get it again and it was not like they gave it to him by the elbow or anything but it just was not as high as he normally gets it in the deltoid muscle but it could very well be. Wants to make sure if getting it at a very low point in the deltoid muscle and will say it was right below it and there was fat there.  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.