seizure; he do not hear well from his left ear can't hear 100%; fever; feel cold; shivers / all his body start to shiver so bad; stomach hurting really bad; muscles are in pain; he do not feel well; had tough times to get sleep; spring hands he could not stand up; vomiting; that day was awful; body hurts really really bad; This is a spontaneous report received from a non-contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the parent.  A male patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), in 2022 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 (Primary Immunization Series Complete; Unknown Manufacturer), for COVID-19 Immunization. The following information was reported: PAIN (non-serious) with onset 2022, outcome "unknown", described as "body hurts really really bad"; FEELING COLD (non-serious) with onset 2022, outcome "unknown", described as "feel cold"; PYREXIA (non-serious) with onset 2022, outcome "unknown", described as "fever"; INSOMNIA (non-serious) with onset 2022, outcome "unknown", described as "had tough times to get sleep"; MALAISE (non-serious) with onset 2022, outcome "unknown", described as "he do not feel well"; DEAFNESS (medically significant) with onset 2022, outcome "unknown", described as "he do not hear well from his left ear can't hear 100%"; MYALGIA (non-serious) with onset 2022, outcome "unknown", described as "muscles are in pain"; SEIZURE (medically significant) with onset 2022, outcome "unknown"; CHILLS (non-serious) with onset 2022, outcome "unknown", described as "shivers / all his body start to shiver so bad"; DYSSTASIA (non-serious) with onset 2022, outcome "unknown", described as "spring hands he could not stand up"; ABDOMINAL PAIN UPPER (non-serious) with onset 2022, outcome "unknown", described as "stomach hurting really bad"; FEELING ABNORMAL (non-serious) with onset 2022, outcome "unknown", described as "that day was awful"; VOMITING (non-serious) with onset 2022, outcome "unknown". The patient underwent the following laboratory tests and procedures: Angiogram abnormal: Unknown results, notes: caller said that they had him electro angiogram; Body temperature: Unknown results. Therapeutic measures were taken as a result of seizure, deafness, pyrexia, feeling cold, chills, abdominal pain upper, myalgia, malaise, insomnia, dysstasia, vomiting, feeling abnormal, pain.  Clinical course: Reporter was a caregiver, calling on behalf of her kids who were vaccinated with Pfizer covid vaccine booster shot, they had really really bad side effects, they received the vaccine Friday or Sunday around 6 Pm or 7PM, "he went to sleep and had tough times to get sleep, fever" after that time in the morning he said, "he do not feel well, he feel cold", that night "brother is not fine, lot of shivers" "from 2 out of 10 level of shiver became 10, all his body start to shiver so bad, spring hands he could not stand up, stomach hurting really bad, vomiting, from 10 to 7 shivering (level)", it was told that it is really bad side effects of the vaccine, they gave him paracetamol 1mg each 8 hours, "that day was awful, but the shiver did not come back, after that day body hurts really really bad, all his muscles are in pain" they gave him paracetamol and Advil as per HCP recommendation at night, "he do not hear well from his left ear can't hear 100%, he had cold (so they thinks it is because of the cold that's why he wasn't hearing well), caller said that they had him electro angiogram and he almost had a seizure.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.