epidemiological features.(1) End-stage renal disease(1) HBsAg(1) IgA, immunoglobulin A(1) Seasonal influenza(1) coronavirus(1) Nigeria(1) CKD, chronic kidney disease(1) ESRD, end-stage renal disease(1) MPGN, membranoproliferative glomerulonephritis(1) Pandemic H1N1 influenza,(1) children(1) ELISA, enzyme-linked immunosorbent assay(1) HBV, hepatitis B virus(1) KDIGO, Kidney Disease Improving Global Outcomes(1) Children,(1) Clinical features(1) Glomerulonephritis(1) AKI, acute kidney injury(1) FSGS, focal segmental glomerulosclerosis(1) hepatitis B-associated nephropathy.(1) COVID-19(1) adolescents(1) nephrotic syndrome(1) HBsAg, hepatitis B surface antigen(1) MCD, minimal change disease(1) Hospitalisation,(1)