almost like convulsions; bad headache/head is hurting; shiver like he was cold/all his body started shivering; shrink; shiver like he was cold; shrink and he couldn't move; vomiting; feeling like crap but shaking didn't come back. body started to hurt really bad, like when you do force you get this fatigue, it is like your body gets an electric shock.; feeling like crap but shaking didn't come back. body started to hurt really bad, like when you do force you get this fatigue, it is like your body gets an electric shock.; cramps in both legs; he stopped hearing from his left ear and I thought/loss of audition/lost 60 percent of the audition from his left ear; throat hurt; nerve inflammated; muscle pain; feeling like crap; This is a spontaneous report received from a non-contactable reporter(s) (Consumer or other non HCP). The reporter is the parent.  A 14-year-old male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), as dose number unknown (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Covid-19 vaccine (Manufacturer Unknown, Primary Immunization completed), for COVID-19 immunization. The following information was reported: SEIZURE (hospitalization, medically significant), outcome "unknown", described as "almost like convulsions"; HEADACHE (hospitalization), outcome "unknown", described as "bad headache/head is hurting"; CHILLS (hospitalization), outcome "unknown", described as "shiver like he was cold/all his body started shivering"; BODY HEIGHT DECREASED (hospitalization), outcome "unknown", described as "shrink"; NASOPHARYNGITIS (hospitalization), outcome "unknown", described as "shiver like he was cold"; MOVEMENT DISORDER (hospitalization), outcome "unknown", described as "shrink and he couldn't move"; VOMITING (non-serious), outcome "unknown"; FATIGUE (non-serious), ELECTRIC SHOCK SENSATION (non-serious), outcome "unknown" and all described as "feeling like crap but shaking didn't come back. body started to hurt really bad, like when you do force you get this fatigue, it is like your body gets an electric shock."; MUSCLE SPASMS (non-serious), outcome "unknown", described as "cramps in both legs"; HYPOACUSIS (non-serious), outcome "unknown", described as "he stopped hearing from his left ear and I thought/loss of audition/lost 60 percent of the audition from his left ear"; OROPHARYNGEAL PAIN (non-serious), outcome "unknown", described as "throat hurt"; NEURITIS (non-serious), outcome "unknown", described as "nerve inflammated"; MYALGIA (non-serious), outcome "unknown", described as "muscle pain"; FEELING ABNORMAL (non-serious), outcome "unknown", described as "feeling like crap". The events "almost like convulsions", "bad headache/head is hurting", "shiver like he was cold/all his body started shivering", "shrink", "shiver like he was cold", "shrink and he couldn't move", "vomiting", "feeling like crap but shaking didn't come back. body started to hurt really bad, like when you do force you get this fatigue, it is like your body gets an electric shock.", "cramps in both legs", "he stopped hearing from his left ear and i thought/loss of audition/lost 60 percent of the audition from his left ear", "throat hurt", "nerve inflammated", "muscle pain" and "feeling like crap" required emergency room visit. The patient underwent the following laboratory tests and procedures: exam: he doesn't have a bad neurological problem, notes: we did an exam, it was on Friday and they saw he doesn't have a bad neurological problem. Therapeutic measures were taken as a result of seizure, headache, chills, body height decreased, nasopharyngitis, vomiting, fatigue, electric shock sensation, muscle spasms, hypoacusis, oropharyngeal pain, neuritis, myalgia, feeling abnormal.  Clinical course: This report was related to related to a study or programme. Reporter clarified after taking the new booster (Clarified as Pfizer COVID 19 Booster vaccine), that recently released. The patient was 14 years old, 12 hours after getting the vaccine he started with really bad side effects like he started with a really bad headache and he was like mom, head was hurting really bad. Took Advil and it was going to pass because they said that this was a side effect. 15 minutes after his head started hurting, he started with shiver like he was cold so read shivers were normal when you got the vaccine. The patient put a coat on and thought it was going to be fine. After 10 minutes that the shiver started, they went from like 0 to 100. So, all his body started shivering. So, it was almost like convulsions. Shivers started to compress his whole body, he started to shrink and he could not move, he could not control his shivers and it was really bad. So went to the hospital. In the hospital, the ER collapsed. So, in the place, in the ER center waiting to get attended and it was like 25 minutes from when it started to when got into the ER. In the ER, after 40 minutes he started vomiting like really really bad and when he started vomiting, the shivers started to lower. So, it was horrible, so all the days he was feeling like crap but the shaking didn't come back. A day after, all his body started to hurt really really bad, like when you do force you get this fatigue, it was like your body gets an electric shock. He got like cramps in both legs. He was like, okay, his body yesterday got really bad bad shiver. Dr. mentioned that he was going to hurt and advised him to take Advil and it was going to be fine. So, his head started hurting really really bad, It was like 24X7, it hurt. So, they told us it was because of the shiver. He was shivering very bad, he was really conscious during the shiver but he never lost consciousness. So, after this, the doctor advised to do an exam of the nerve in his head because when you shiver this strong like he did, sometimes might get neurological problems. So did an exam, it was on Friday and they saw he doesn't have a bad neurological problem. He had this shaking but not to worry, he was going to be fine but on Tuesday (Day 8), he stopped hearing from his left ear and thought, he got a cold also and the cold was a side-effect of the vaccine, so thought the loss of audition from his left ear was a consequence because he had a cold. The cold wasn't that bad, his throat hurt but nothing like really bad. After a couple of days, he was not hearing well. This doctor that has a specialty on audition and throat and he was like okay, his ear, his tympanum was fine, but he was not hearing. He lost 60 percent of the audition from his left ear, he was not hearing. Started to loose audition because a nerve in the ear because of the vaccine gets inflammated. They told us few times to stop this and go back. It was what the doctor was thinking that a nerve inflammated because of the vaccine. The reporter stated he was not like 100 percent deaf, but he was hearing with 40 percent from his left ear. Limited information was available.