خيارات البحث
النتائج 1 - 4 من 4
Potentially virulent newcastle disease viruses are maintained in migratory waterfowl populations
1998
Takakuwa, H. (Hokkaido Univ., Sapporo (Japan)) | Ito, T. | Takada, A. | Okazaki, K. | Kida, H.
Forty-seven Newcastle disease virus (NDV) strains isolated from fecal samples of waterfowls in Alaska and Siberia from 1991 to 1996 were analyzed for their virulence. None of the viruses formed plaques on MDBK cells in the absence of trypsin. Of these, 29 strains showed virulent character by the mean death time with the minimum lethal dose in chicken embryos comparable to velogenic NDV strains. Of the 29 strains, 11 were sequenced for their fusion protein (F) gene. The results showed that 5 of them contained a pair of dibasic amino acids at the cleavage site of the F, which is of a virulent type. The present results suggest that potentially virulent strains of NDV are maintained in migratory waterfowl populations in nature, and that some of those may be transmitted to domestic poultry and acquire pathogenicity during passages in chicken population
اظهر المزيد [+] اقل [-]Differential diagnosis among Marek's disease, reticuloendotheliosis and avian leukosis by polymerase chain reaction
1998
Seong, H.W. (National Veterinary Research Institute, RDA, Anyang (Korea Republic)) | Kim, S.J. (Seoul National University, Suwon (Korea Republic). College of Veterinary Medicine)
The effect of anticoccidial drugs for coccidial vaccines
1998
Youn, H.J. (Seoul National University, Suwon (Korea Republic). College of Veterinary Medicine) | Noh, J.W. (Shincheongbong Farm, Suwon (Korea Republic))
Immunogenetic characterization of Korean native chickens by monoclonal anibodies to chicken leukocyte differentiation antigens
1998
Park, Y.H. | Seo, K.S. (Seoul National University, Suwon (Korea Republic). College of Veterinary Medicine) | Hahn, J.Y. | Oh, B.K. (Seoul National University, Suwon (Korea Republic). College of Agricultural Life Science) | Moon, J.S. | Koo, B.K. | Joo, Y.S. (National Veterinary Research Institute, RDA, Anyang (Korea Republic)) | Lillehoj, H.S. (USDA-ARS,(USA)) | William C.D. (Washington State University, Washington (USA))
