started having in and out consciousness; epilepsy seizures; bone infection behind the left ear; hip infection in the right portion of his hip for three weeks; having difficulty regulating his body temperature; his head felt like it was pounding/headache; body is cramping really bad; shaking really bad; throat was itching; Body aches; ear aches; toe aches; difficulty in walking; bone still ached; swollen inside his body; weak; muscles barely ache now; This is a spontaneous report from a contactable consumer (patient's mother). A 12-year-old male patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection) via an unspecified route of administration, administered in right arm on 18May2021 at 09:00 (Batch/Lot Number: EW0168) (at the age of 12-years-old) as dose 1, single for COVID-19 immunisation. Vaccination facility type was a hospital. The vaccine was not administered at military facility. Medical history included deletion 22q from Sep2008 to an unknown date diagnosed at birth, congenital heart defects from 30Sep2008 to an unknown date (When he was two weeks old on 30Sep2008, he had ASD, VSD, and the coarch was repaired), anonx brain injury from 02Oct2008 to an unknown date (lack of oxygen to the brain), submucous cleft palate diagnosed in 2013, immunocompromised (His immune system is considered as compromised and has a complex medical condition), lymphadenectomy (When the patient was a little baby, they cut his lymphatic system and he was on a man-made formula for a while to repair that), atrial septal defect (ASD) from 30Sep2008 to an unknown date, ventricular septal defect (VSD) from 30Sep2008 to an unknown date, coarch was repaired (coarctation of the aorta) from 30Sep2008 to an unknown date and he was on a "gtube" from birth until 2012. The patient's concomitant medications were not reported. The patient has no relevant family medical history related to adverse events. The patient had no prior vaccinations (within 4 weeks). The patient had three chicken pox vaccines and shows that he has not built an immunity. The patient's grandmother and mother reported that the patient is immunocompromised, and he experienced a really bad reaction about 15 to 40 minutes after the administration of the first dose. Side effects he experienced were a feeling of pounding on his head, his body was cramping really bad, started having in and out consciousness, shaking really bad, his throat was itching a little bit, epilepsy seizures. He got an epi pen shot to remedy the side effects. He was released from the hospital about 8 to 9 hours later. The side effects have been continuous. Headache lasted about 15 weeks after the shot. They mentioned that his body aches, earaches, toe aches and he had difficulty walking was continuous. The patient crawled across the floor for about 8 weeks due to the difficulty walking. The muscles barely ache now. He had a bone infection behind the left ear. They also mentioned a hip infection in the right portion of his hip for three weeks. The main concern is the mobility of the patient having difficulty walking. His bone still ached and got 5 blood draws. He was having difficulty regulating his body temperature. His doctors just couldn't find anything, and the family are having difficulties how to talk to anybody even remotely about his condition. Doctors are not sure why he has a reaction with the vaccine. The patient's mother was asking for medical advice in getting the second dose and referred her to her son's doctor for treatment recommendations. Her son is medical fragile and immunocompromised, and it was rare. She thinks he is finally ok. The ortho put him on Aleve since they thought he was swollen inside his body, had body aches. He did ten days of Aleve and has not complained and mentioned in the last couple of days has felt a lot better and has had no headaches. Clarified that he has recovered from the body aches, but he is still weak and has a hard time once in while standing up. Patient's mother stated that it is hard to tell if that was part of the reaction or his medical conditions. She thinks he is back to baseline and in the last couple weeks he has been good. Indication was prevention, quarantined and cannot leave house without it. The events required a visit to the Emergency Room (ER) and Physician Office. The patient was not admitted to the hospital and he was in the ER. He had 5 blood draws after the first dose, he saw doctors from immunology and neurology. She will have the patient's doctor call back since she does not know what to do for him. Relevant test included blood test with unknown results. The outcome of the events was recovered on an unspecified date in Sep2021.  No follow-up attempts are possible. No further information is expected.