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Immunofluorescent localization of Staphylococcos aureus antigen in acute bacterial endocarditis nephritis.

A 75-year-old man with Staphylococcus aureus endocarditis in whom acute diffuse proliferative glomerulonephritis developed is described. The light- and electron-microscopic changes of the glomeruli in this case were identical to those of acute poststreptococcal glomerulonephritis. Immunofluorescence revealed deposition of immunoglobulins and complement in the glomeruli. In addition, bacterial antigenic material was demonstrated in the glomeruli by indirect immunofluorescence. These observations further support the hypothesis of an immune-complex pathogenesis in this form of glomerulonephritis.