Abstract:

Two strains of Riemerella anatipestifer (RA1156 and RA1157) had been isolated from the same duck farm interval of four days. To compare the differences of the two strains, plate agglutination and agar gel precipitation tests were used to identify the serotypes of them, Kirby-Bauer method was used to detect the drug sensitivities, and animal testing was used to determine the pathogenic of them. The results showed that both of two strains were serotype 11, had the same pathogenic to duck, and had the same sensitivities to most drugs. Strain RA1156 was sensitive to Gentamicin and Penicillin, while strain RA1157 was resistant to these two drugs. This test confirmed the presence of serotype 11 Riemerella anatipestifer in Fujian province and added the epidemiological data of Riemerella anatipestifer. Compared with laboratory artificially induced, the strain in vivo might get the resistance to drug easier.