Delirium; Mild hallucinations; Moderate to severe whole-body pain; Blurred vision; Dizziness; Moderate lasting joint soreness / stiffness for approximately 3-4 months; Moderate lasting joint soreness / stiffness for approximately 3-4 months; Fever gradually worsening, reaching 106 degree F via oral thermometer appx; Moderate to severe headache due to fever intensity; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 23 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 11May2021 17:00 (Lot number: EW0170) as dose 2, single for covid-19 immunisation. Relevant medical history included: "Lactose intolerant" (unspecified if ongoing), notes: Patient is lactose intolerant.; "History of occasional syncope in patient. Family history: diabetes, cancer, dementia" (unspecified if ongoing), notes: History of occasional syncope in patient. Family history: diabetes, cancer, dementia. The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose Number: 1, Batch/Lot No: EW0161, Location of injection: Arm Left, Vaccine Administration Time: 05:00 PM), administration date: 20Apr2021, when the patient was 23 years old, for Covid-19 immunization.  The following information was reported: DELIRIUM (medically significant) with onset 13May2021 02:00, outcome "recovered with sequelae", described as "Delirium"; HALLUCINATION (medically significant) with onset 13May2021 02:00, outcome "recovered with sequelae", described as "Mild hallucinations"; PAIN (non-serious) with onset 13May2021 02:00, outcome "recovered with sequelae", described as "Moderate to severe whole-body pain"; VISION BLURRED (non-serious) with onset 13May2021 02:00, outcome "recovered with sequelae", described as "Blurred vision"; DIZZINESS (non-serious) with onset 13May2021 02:00, outcome "recovered with sequelae", described as "Dizziness"; JOINT STIFFNESS (non-serious), ARTHRALGIA (non-serious) all with onset 13May2021 02:00, outcome "recovered with sequelae" and all described as "Moderate lasting joint soreness / stiffness for approximately 3-4 months"; PYREXIA (non-serious) with onset 13May2021 02:00, outcome "recovered with sequelae" (May2021), described as "Fever gradually worsening, reaching 106 degree F via oral thermometer appx"; HEADACHE (non-serious) with onset 13May2021 02:00, outcome "recovered with sequelae", described as "Moderate to severe headache due to fever intensity". The events "delirium", "mild hallucinations", "moderate to severe whole-body pain", "blurred vision", "dizziness", "moderate lasting joint soreness / stiffness for approximately 3-4 months", "moderate lasting joint soreness / stiffness for approximately 3-4 months", "fever gradually worsening, reaching 106 degree f via oral thermometer appx" and "moderate to severe headache due to fever intensity" were evaluated at the physician office visit. The patient underwent the following laboratory tests and procedures: body temperature: (13May2021) 106 Fahrenheit, notes: Fever gradually worsening, reaching 106 degree F via oral thermometer appx. 32-34 hours after receiving second dose of Pfizer vaccine. Therapeutic measures were taken as a result of delirium, hallucination, pain, vision blurred, dizziness, joint stiffness, arthralgia, pyrexia, headache. Clinical course: Fever 32-34 hours after receiving second dose of Pfizer vaccine. 1000mg Acetaminophen given orally produced no observed improvement in symptoms. Cognitive impairment associated with symptoms prevented patient from calling 911 or visiting E.R. (patient was unattended overnight and experiencing delirium / hallucinations.) Cool / tepid bath administered, which reduced fever satisfactorily. Naproxen and acetaminophen continued as needed for fever. Fever, most body pain resolved in appx. 5 days. Moderate lasting joint soreness / stiffness for approximately 3-4 months, presumed due to fever. No symptoms at present (11 months later).  No follow-up attempts are possible. No further information is expected.