within half an hour I had a fever of 102 degree Fahrenheit; Patient allergic to some of the contents; Initial information received on 06-Oct-2021 regarding an unsolicited valid Social Media serious case received from a consumer/non-health care professional.  This case involves adult and unknown gender patient who experienced event within half an hour I had a fever of 102-degree Fahrenheit (pyrexia) and patient allergic to some of the contents (Hypersensitivity) while receiving INFLUENZA VACCINE.  It was unknown if the patient had any medical history, concomitant disease, or risk factor. The patient medical treatment(s), vaccination(s), concomitant medication, and family history were not provided.   On an unknown date, the patient received a dose of suspect INFLUENZA VACCINE produced by unknown manufacturer [lot number and expiry date not reported] via an unknown route in unknown administration site for prophylactic vaccination.  On an unknown date, the patient developed a serious event within half an hour I had a fever of 102-degree Fahrenheit (pyrexia) (unknown latency) following the administration of INFLUENZA VACCINE. The patient was hospitalized for this event for 3 weeks.  On an unknown date the patient developed a non-serious patient allergic to some of the contents (hypersensitivity) (unknown latency) following the administration of INFLUENZA VACCINE.  It was reported "patients doctor tells it would likely kill patient as patient was allergic to some of the contents. The two times patient did get the flu shot; within half an hour patient had a fever of 102-degree Fahrenheit. Once, yeah, maybe patient already had the flu, but not 2 times the same. Both times patient was hospitalized for 3 weeks and both times patient had fevers as high as 105, when it had been measured and it may have been higher according to the doctor. I have never had the flu longer than 7 days except those 2 times, so never again. Already had COVID-19 in January and February 2020, before they were sure it was here. The first week was sore throat, then a fever then ok for 2 days then felt bad off and on the rest of the 3 1/2 weeks, much like the flu, but a longer time. Still have the numb spots on my fingertips and some areas on the soles of my feet. The numb spots on my fingertips are strange in that most of the time the touch screens don't react to contact with the numb spots, so patient have to move my fingers around to find a spot that works".  It was unknown if there were lab data/results available.  It was unknown if the patient experienced any additional symptoms/events.  It was not reported if the patient received any corrective treatment for the events.  At time of reporting, the outcome was unknown for the events.  Information on the batch number was requested.; Sender's Comments: This case involves adult and unknown gender patient who experienced pyrexia and Hypersensitivity after vaccination with INFLUENZA VACCINE (unknown manufacturer). The time to onset is unknown. There is no further information regarding patient's medical condition at time of vaccination, history and laboratory tests ruling out alternate etiologies. Based upon the reported information, the role of the vaccine cannot be assessed.