The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021; The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021; The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021; a flare up of his vasculitis glomerulonephritis kidney disease stage 4; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). Other Case identifier(s): 2022CCX00281 (Company). A 67-year-old male patient received BNT162b2 (BNT162B2), in 2021 as dose 3 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history included: "vasculitis glomerulonephritis kidney disease stage 4", start date: 2013 (unspecified if ongoing); "vasculitis glomerulonephritis kidney disease stage 4", start date: 2013 (unspecified if ongoing); "vasculitis glomerulonephritis kidney disease stage 4", start date: 2013 (unspecified if ongoing). The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose 1), for COVID-19 immunization, reaction(s): "The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021", "The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021", "The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021"; Bnt162b2 (Dose 2), for COVID-19 immunization, reaction(s): "The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021", "The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021", "The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021". The following information was reported: GLOMERULONEPHRITIS (medically significant), NEPHROPATHY (non-serious), VASCULITIS (non-serious) all with onset 2021, outcome "unknown" and all described as "The patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021"; DISEASE RECURRENCE (non-serious) with onset 2021, outcome "unknown", described as "a flare up of his vasculitis glomerulonephritis kidney disease stage 4"; IMMUNE SYSTEM DISORDER (non-serious), outcome "unknown", described as "messed with his immune system". Clinical course: On 08Aug2022, it was reported that a patient started treatment on an unspecified date with the Covid vaccine and boosters (Mfr. Pfizer) at unreported doses and frequencies of administration for vaccination. It was reported the patient experienced a flare up of his vasculitis glomerulonephritis kidney disease stage 4 in the spring of 2021 (it had previously been diagnosed in 2013, then went into remission). They (not further clarified) thought the COVID vaccine and boosters caused the flare up and that it really messed with his immune system. No further follow-up is anticipated. No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.; Sender's Comments: Linked Report(s) :PFIZER INC-202201071121 Same patient/drug, Same AE, different dose of vaccine;PFIZER INC-202201071122 Same patient/drug, Same AE, different dose of vaccine;