| human and animal epidemic of yersinia enterocolitica o:9, 1989-1997, auvergne, france. | yersinia enterocolitica o:9 infections were reported in auvergne in 1988 to 1989, while brucellosis due to brucella abortus was almost eliminated. the serologic cross-reactions between the two bacteria complicated the diagnosis of brucellosis cases. in 1996, human cases of yersinia enterocolitica o:9 infection were detected, with a peak incidence of 12 cases. veterinary surveillance could have predicted the emergence of this disease in humans. | 1999 | 10511531 |