grand mal seizures; she will stop breathing when she has these seizures; it progressed rapidly where she has lost all feeling in left side from waist down; Paraesthesia aggravated; Numbness her left foot; Numbness her left foot; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team, Program ID: (Unknown). The reporter is the parent.  A 14-year-old female patient received BNT162b2 (BNT162B2), in 2021 as dose number unknown, single (Batch/Lot number: unknown) at the age of 14 years for covid-19 immunisation. The patient's relevant medical history included: "Hemiplegic cerebral palsy" (unspecified if ongoing), notes: She was born with Hemiplegic cerebral palsy; "COVID-19", start date: 2021 (unspecified if ongoing), notes: Mild; "tingling and numbness her left foot", start date: 2021 (unspecified if ongoing); "tingling and numbness her left foot", start date: 2021 (unspecified if ongoing); "developmental delays" (unspecified if ongoing). The patient's concomitant medications were not reported. The following information was reported: GENERALISED TONIC-CLONIC SEIZURE (hospitalization), 2 weeks after the suspect product(s) administration, outcome "unknown", described as "grand mal seizures"; RESPIRATORY ARREST (hospitalization), outcome "unknown", described as "she will stop breathing when she has these seizures"; SENSORY LOSS (non-serious), outcome "unknown", described as "it progressed rapidly where she has lost all feeling in left side from waist down"; PARAESTHESIA (non-serious), outcome "unknown", described as "Paraesthesia aggravated"; HYPOAESTHESIA (non-serious), CONDITION AGGRAVATED (non-serious), outcome "unknown" and all described as "Numbness her left foot". Therapeutic measures were taken as a result of respiratory arrest. Clinical course: Reporter's daughter had developmental delays and was born with hemiplegic cerebral palsy.  She got 'real mild' Covid 19 in 2021 with tingling and numbness her left foot. These symptoms started before the vaccine. After it went away, a couple of months later, she received the Pfizer Covid 19 vaccine in 2021 at 12 years old at (institution name), upon suggestion from her provider, based on her medical history.  She got progressively worse after she got her vaccine; it seemed like it progressed rapidly where she had lost all feeling in left side from waist down.  She had symptoms before the vaccine and it may be due to the COVID or her cerebral palsy but it seemed to progress rapidly after vaccine. It could be totally unrelated.  Reporter really think it was something generic but possibly the vaccine had triggered something that was already there. To reporter it seems like that patients body was trained to fight off the vaccine, we were not 100% sure and grasping at straws. Reporter do not had patients vaccination card at this time but he think it was the original monovalent Pfizer vaccine for adults. She was currently now 14 years old and currently in the hospital.  She started having that weird seizures; she will stop breathing when she had these seizures. On Tuesday (04Apr2023), they had to do a "bone drill" and had to put an IV in her bone marrow to get her to breathe again.    The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.