We report the first case of blood culture-positive Yersinia enterocolitica serotype O:8 septicemia in Japan. Y. enterocolitica serotype O:8 infection is very rare, but chromosomal DNA analysis suggested that this bacterium may persist latently in healthy carriers throughout Japan.

Glomerulonephritis, such as membranous nephropathy, IgA nephropathy, and p-antineutrophil cytoplasmic autoantibody (ANCA)-related crescentic glomerulonephritis, has been shown to occur in rheumatoid arthritis (RA). However, the occurrence of two types of glomerulonephritis in a patient with RA is rarely observed. Here, we describe a patient with RA who developed crescentic glomerulonephritis with antimyeloperoxidase (MPO) antibodies during the course of IgA nephropathy. This case indicates that crescentic glomerulonephritis and IgA nephropathy may occur together in association with p-ANCA in RA.