PLA2R1 and focal segmental glomerulosclerosis: In a study of 15 chikungunya patients in Brazil who underwent kidney biopsy, the following histopathological lesions were identified: focal segmental glomerulosclerosis (FSGS), class IV lupus nephritis, crescentic glomerulonephritis, thrombotic microangiopathy, pauci-immune vasculitis, PLA2R-positive membranous nephropathy, and collapsing glomerulosclerosis23.