Started with convulsion-like violent shaking/ was stillshaking until about 12:45; 101.5 fever/  had a low-grade fever (99/100) until about 4:30, when temperature jumped up to 103.5 again.; Temperature had risen to 103.5/ temperature rose to an even 104; This is a spontaneous report from a contactable consumer, the patient. A 21-year-old non-pregnant female patient received the second dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: EW0161) via an unspecified route of administration in the left arm on 17Apr2021 at 10:30 (at the age of 21-years-old) as a single dose for COVID-19 immunisation. Medical history included exercise induced asthma. Prior to the vaccination, the patient was not diagnosed with COVID-19. The patient did not receive any other vaccines within four weeks prior to the COVID-19 vaccine. Concomitant medication included ethinylestradiol; etonogestrel (NUVARING) from an unknown date for birth control. The patient previously took first dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: ER2613) via an unspecified route of administration in the left arm on 27Mar2021 at 10:00 (at the age of 20-years-old) as a single dose for COVID-19 immunisation. On 17Apr2021 at 20:45, the patient experienced started with convulsion-like violent shaking about 10 hours after injection, with a 101.5 fever, an hour later on an unknown date in Apr2021, almost midnight; temperature had risen to 103.5 and she was still shaking until about 12:45, where her temperature rose to an even 104. At this point, she called the emergency 24 hours number for her doctor, who advised her to alternate Tylenol and ADVIL every few hours and continued drinking fluids. Temperature stayed in the 101/102 range until almost 4am. The following day, had a low-grade fever (99/100) until about 4:30, when temperature jumped up to 103.5 again. The event resulted in doctor or other healthcare professional office/clinic visit. Therapeutic measures were taken as a result of the events and included treatment with over the counter (OTC) medication. On 17Apr2021 at 22:45, the patient underwent Body Temperature and the result was 101.5 (UNSPECIFIED UNITS). On 18Apr2021, the patient underwent Body Temperature and the result was 101/102 (UNSPECIFIED UNITS). On 18Apr2021 at 00:45, the patient underwent Body Temperature and the result was 104 (UNSPECIFIED UNITS). On an unknown date in Apr2021, the patient underwent Body Temperature and the result was 103.5 (UNSPECIFIED UNITS). On an unknown date in Apr2021, the patient underwent Body Temperature and the result was 99/100 (UNSPECIFIED UNITS). On an unknown date in Apr2021, the patient underwent Body Temperature and the result was 103.5 (UNSPECIFIED UNITS). Since the vaccination, it was unknown whether the patient had been tested for COVID-19. The clinical outcome of the events started with convulsion-like violent shaking, with a 101.5 fever, temperature had risen to 103.5 and she was still shaking until about 12:45, where her temperature rose to an even 104, temperature stayed in the 101/102 range, had a low-grade fever 99/100 until about 4:30, when temperature jumped up to 103.5 again was recovering at the time of reporting.  No follow up attempts are needed. No further information is expected.