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      Renal Involvement Induced by Human Parvovirus B19 Infection

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          In an attempt to clarify the renal involvement induced by human parvovirus B19 (HPB19) infection, we investigated 6 adult patients with transient urinary abnormalities followed by erythema infectiosum. All patients had HPB19-specific IgM antibody and showed mild proteinuria of 0.2–1.2 g/day with or without microscopic hematuria. In 5 patients a decrease of complement was present, and in 2 the circulating immune complex levels were elevated. All patients showed mild or moderate endocapillary proliferation with leukocytic infiltrates in glomeruli and leukocytic infiltrates with edema around interlobular arteries and arterioles. Immunofluorescence microscopy revealed C3c deposits with immunoglobulins along the glomerular capillary walls and in the walls of small arteries and arterioles. Electron microscopic studies showed swelling of the endothelial cells and small electron-dense deposits in mesangium (in all 6 patients) and subendothelium (in 5 of 6 patients). However, HPB19 VP1 and VP2 capsid antigens were not demonstrated in the glomerulus or the vascular wall in any patient. These findings suggest that the renal lesions caused by an immune complex mediated phenomenon would be closely correlated with the HPB19 infection, although the precise mechanism is not entirely clear, and that in adults HPB19 should be thought of as a possible cause of acute postinfectious glomerulonephritis.

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          Acute parvovirus B19 infection associated with fulminant hepatitis of favourable prognosis in young children.

          The cause of fulminant hepatitis (FH) in children is unexplained in up to 50% of cases. We report parvovirus B19 as an agent associated with FH in children and compare clinical characteristics of these patients with those of age-matched patients with FH of other origin. 45 patients presented with FH. No cause was apparent in 21 patients. Parvovirus B19 genome was retrospectively sought by PCR in serum collected at admission in 41 patients. Parvovirus B19 genome was detected in serum from four of 21 patients with unexplained FH (four of 11 younger than 5 years). No B19 DNA was detected in serum from patients with other types of FH or from 82 patients with biliary atresia. Parvovirus B19 IgM was detected in one of the four patients. Patients with parvovirus B19 infection had significantly lower bilirubin concentrations than age-matched patients with FH due to hepatitis A (nine) or other causes (nine) (poisoning with amanita excluded). All patients with parvovirus B19 survived without orthotopic liver transplantation, with restoration of normal liver function within 17 days. In patients younger than 5 years with FH of unexplained origin, evidence of acute parvovirus B19 was associated with a distinct clinical pattern. In particular, low bilirubin concentrations and rapid recovery of liver function without transplantation were distinctive features.

            Author and article information

            S. Karger AG
            10 October 2001
            : 89
            : 3
            : 280-285
            Departments of aInternal Medicine and bPathology, Kurobe City Hospital, Kurobe, Japan
            46086 Nephron 2001;89:280–285
            © 2001 S. Karger AG, Basel

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            Figures: 3, Tables: 4, References: 24, Pages: 6
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