Felt a little brain fog for the first day; Tired; couldnt sleep for a few nights.; Felt feverish; Food was more sour; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) for a Pfizer sponsored program. The reporter is the patient.  A 42 year-old patient received bnt162b2 (BNT162B2), intramuscular, administered in arm left, administration date 19Mar2021 (Lot number: ER8727) at the age of 42 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "COVID-19", start date: Feb2020 (unspecified if ongoing), notes: Lost sense of taste for 5months. very mild case. No fever.; "I felt low on oxygen\wasn't getting enough oxygen", start date: 13Feb2020 (unspecified if ongoing); "Dry cough", start date: 21Jan2020 (unspecified if ongoing), notes: I still had a lingering cough; "felt a little sick to my stomach", start date: 13Feb2020 (unspecified if ongoing); "lost my sense of taste", start date: 14Feb2020 (unspecified if ongoing); "I had brain fog", start date: 13Feb2020 (unspecified if ongoing); "plantar fasciitis", start date: Jan2021 (unspecified if ongoing), notes: It was difficult to run. switched to cycling instead of running for a few months. Also, started switching the routine so did aerobic/anaerobic every other day and winded after every aerobic exercise. In Feb2021, foot was feeling better, and started running again. There were no concomitant medications. The following information was reported: DYSGEUSIA (non-serious) with onset 2021, outcome "unknown", described as "Food was more sour"; FEELING ABNORMAL (non-serious) with onset Mar2021, outcome "unknown", described as "Felt a little brain fog for the first day"; FATIGUE (non-serious) with onset Mar2021, outcome "unknown", described as "Tired"; INSOMNIA (non-serious) with onset 2021, outcome "unknown", described as "couldnt sleep for a few nights."; PYREXIA (non-serious) with onset 2021, outcome "unknown", described as "Felt feverish". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: In 13Feb2020, patient felt really strange at work and had to come home. Patient had brain fog, and fever-like symptoms without the fever, fell asleep early that night. In Mar2020, Last time grocery shopping before lock-down and stay-at-home order.  It was difficult to run (used to run 3 miles a day at 6-7 mph. could only run maybe mph and could only go 2 miles before got too winded to continue). In Apr 2020, had diminished taste (food tasted like dirt), and had trouble running, though it was gradually improving. In Jul2020, had sense of taste mostly back by then. foods patient used to like that did not like any more like Chili Cheese Fritos. In Sep2020, could finally run at 6 mph for 3 miles again, though was always winded after the run and felt like was getting old. Could run 6-7 mph for 3 miles but was really winded by the end. On 19Mar2021, Got 1st dose of Pfizer COVID-19 vaccine. Felt a little brain fog for the first day, and was tired but could not sleep for a few nights. Food also tasted sour for a few weeks. Patient nearly threw out some milk because thought it had gone bad. But the rest of the family said it tasted just fine. Running was really hard again for a week or two.  No follow-up attempts are possible. No further information is expected.