Abstract: he purpose of this paper was to study biochemical characteristics, drug sensitivity, serotype and pathogenic infection of Riemerella anatipestifer(RA) from geese. One goose isolate from an infected farm of the suburb of Yangzhou were isolated, cultured, stained, tested by microscopy, biochemical identified, and slide agglutination test. The results showed that the isolate was Ⅱ serotype RA. While no Newcastle disease virus, avian influenza virus, and gosling plague virus were isolated by hemagglutination test (HA) and agar-gel precipitin test (AGP).At the same time, the isolate was used to infect 15-days-old geese,the isolate attacked the geese through intravenous injection, subcutaneous injection and intranasal three infected ways. The results showed that RA had strong pathogenicity to Yangzhou goose, which prompted us, the Rimer ella anatipestifer pathogenicity and dissemination should also be taken fully into account in the immunization programs for goose.

Key words: geese; Riemerella anatipestifer; biochemical identification; agglutination test; pathogenicity