I have HTLV-1; thirst; dry mouth; excessive bruising; exhaustion; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 48-year-old female patient (not pregnant) received BNT162b2 (BNT162B2), on 21Dec2021 at 17:30 as dose 3 (booster), single (Lot number: FJ1611) at the age of 48 years, in left arm for covid-19 immunisation. The patient's relevant medical history included: "I was a regular blood donor" (unspecified if ongoing), notes: I was a regular blood donor to the (Institution Name Withheld). I donated in Aug2021 and my donation was accepted. Concomitant medication(s) included: PROGESTERONE; MONTELUKAST; ESTRADIOL;TESTOSTERONE. Vaccination history included: BNT162b2 (Dose Number: 2, Batch/Lot No: EW0167, Location of injection: Arm Left, Vaccine Administration Time: 12:30 PM), administration date: 03May2021, when the patient was 47-year-old, for COVID-19 Immunization; BNT162b2 (Dose Number: 1, Batch/Lot No: EW0151, Location of injection: Arm Left, Vaccine Administration Time: 11:15 AM), administration date: 05Apr2021, when the patient was 47-year-old, for COVID-19 Immunization. The following information was reported: HTLV-1 CARRIER (medically significant) with onset 29Dec2021, outcome "not recovered", described as "I have HTLV-1"; DRY MOUTH (non-serious) with onset 29Dec2021, outcome "not recovered"; CONTUSION (non-serious) with onset 29Dec2021, outcome "not recovered", described as "excessive bruising"; FATIGUE (non-serious) with onset 29Dec2021, outcome "not recovered", described as "exhaustion"; THIRST (non-serious) with onset 29Dec2021, outcome "not recovered". The events "i have htlv-1", "thirst", "dry mouth", "excessive bruising" and "exhaustion" required physician office visit. The patient underwent the following laboratory tests and procedures: Haemoglobin: (15Dec2021) unknown results, notes: I tried to donate on 15Dec2021, but failed to meet the minimum hemoglobin requirement; (29Dec2021) Unknown results, notes: I went back on 29Dec2021 and only met the hemoglobin requirement for a regular donation but not a power red donation; HTLV-1 test: (unspecified date) Unknown results, notes: I had one reactive and one non-reactive test for HTLV-1. Therapeutic measures were taken as a result of htlv-1 carrier, thirst, dry mouth, contusion, fatigue. Additional information: Adverse event: I was a regular blood donor to the (Institution Name Withheld). I donated in Aug2021 and my donation was accepted. I tried to donate on 15Dec2021, but failed to meet the minimum hemoglobin requirement. I went back on 29Dec2021 and only met the hemoglobin requirement for a regular donation but not a power red donation. I have never failed the hemoglobin test before. I made the regular donation and they sent me a letter a couple of weeks later informing me that I had one reactive and one non-reactive test for HTLV-1. My partner was tested and is negative. I do not use drugs, have not had a blood transfusion or organ transplant. The only thing that happened between Aug2021 and Dec2021 that could have given it to me is the covid vaccine. I have since had confirmation tests by my primary care doctor who referred me to (Name Withheld), a hematologist. Her additional tests confirmed I have HTLV-1. My current symptoms are excessive thirst, dry mouth, excessive bruising and exhaustion.