bad blood clots in his leg, pelvis and lung; leg started to swell and was discolored; bad blood clots in his leg, pelvis and lung; bad blood clots in his leg, pelvis and lung; leg started to swell and was discolored; started with having pain; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the parent.  A 36-year-old male patient received bnt162b2, bnt162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), in Sep2022 as dose 3 (booster), single (Batch/Lot number: unknown) at the age of 35 years intramuscular for covid-19 immunisation. The patient's relevant medical history included: "Epilepsy", start date: 2000 (ongoing), notes: Epilepsy began at age 13 and it was probably the year 2000 when it started and he will be on medication for life for that; "Diabetes" (ongoing), notes: Diabetes thinks he has had diabetes for probably about 6 years or 5 years maybe; "high blood pressure" (ongoing), notes: high blood pressure began probably around 4-5 years ago. There were no concomitant medications. Vaccination history included: Bnt162b2 (DOSE 1, SINGLE), administration date: 2021, for Covid-19 Immunization; Bnt162b2 (DOSE 2, SINGLE), administration date: 2021, for Covid-19 Immunization.The following information was reported: THROMBOSIS (hospitalization), PELVIC VENOUS THROMBOSIS (hospitalization, medically significant), PULMONARY THROMBOSIS (hospitalization, medically significant) all with onset 03Nov2023, outcome "unknown" and all described as "bad blood clots in his leg, pelvis and lung"; PERIPHERAL SWELLING (hospitalization), SKIN DISCOLOURATION (hospitalization) all with onset 03Nov2023, outcome "unknown" and all described as "leg started to swell and was discolored"; PAIN (hospitalization) with onset 03Nov2023, outcome "unknown", described as "started with having pain". The patient was hospitalized for thrombosis, peripheral swelling, pelvic venous thrombosis, pulmonary thrombosis, skin discolouration, pain (start date: 05Nov2023). The events "bad blood clots in his leg, pelvis and lung", "leg started to swell and was discolored" and "started with having pain" required emergency room visit. The patient underwent the following laboratory tests and procedures: Blood test: Unknown results; Computerised tomogram: blood clot in his pelvis; Ultrasound Doppler: blood clot; X-ray: xrays showed the ones in his lung. Therapeutic measures were taken as a result of thrombosis, peripheral swelling, pelvic venous thrombosis, pulmonary thrombosis, skin discolouration, pain. Clinical course: Patient received the original Pfizer Covid shot two years ago. Then he received a booster shot in September 2022 for work. He is now in the hospital with bad blood clots in his leg, pelvis and lung.  He is being tested to see if anything genetic is going on.The patient started with having pain on Friday 03Nov2023 so she is assuming that is when the blood clots started and they got progressively worse and his leg started to swell and was discolored by Sunday.They are running a whole bunch of tests and cat scans, dopplers, and blood work and he is on Heparin and they have to do a procedure tomorrow to take out the blood clot in the leg.  She has no dates of tests or results to provide and states she has none of that yet and the doppler obviously showed the blood clot and the cat scan showed the blood clot in his pelvis and the xrays showed the ones in his lung and for the blood work they received some of that but do not know the test results because they maybe take a week or two to get back. The information on the batch/lot number for bnt162b2, bnt162b2 omi ba.4-5 has been requested and will be submitted if and when received.