Affiner votre recherche
Résultats 1-4 de 4
Prevalence of virulence and cytolethal distending toxin (CDT) genes in thermophilic Campylobacter spp. from dogs and humans in Gyeongnam and Busan, Korea
2014
Cho, H.H., Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang, Republic of Korea | Kim, S.H., Viral infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea | Min, W.G., Gyeongsang National University, Jinju, Republic of Korea | Ku, B.K., Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang, Republic of Korea | Kim, Y.H., Gyeongsang National University, Jinju, Republic of Korea
The prevalence of thermophilic Campylobacter (C.) spp. in stray, breeding, and household dogs was 25.2, 12.0, and 8.8%, respectively. C. jejuni and C. upsaliensis were the predominant Campylobacter spp. from household dogs. cdtA, cdtB, and cdtC were detected by PCR in all isolates. Despite the high cytolethal distending toxin (CDT) gene prevalence, only 26 (31%) C. jejuni strains and one (15.3%) C. coli strain showed evidence of CDT production in HEp-2 cell cytotoxicity assays. Virulence-associated genes detected in the C. jejuni and C. coli isolates were cadF, dnaJ, flaA, racR, ciaB, iamA, pldA, virB11, ceuE, and docC. cadF, dnaJ, flaA, and ceuE were found in all C. jejuni and C. coli isolates. When detecting Guillain-Barre syndrome-associated genes (galE, cgtB, and wlaN), galE was identified in all isolates. However, cgtB and wlaN were more prevalent in C. jejuni isolates from humans than those from dogs. Adherence and invasion abilities of the C. jejuni and C. coli strains were tested in INT-407 cells. A considerable correlation (adjusted R©�= 0.678) existed between adherence and invasion activities of the Campylobacter spp. isolates.
Afficher plus [+] Moins [-]Characterization and comparison of the pathogenicity of viscerotropic velogenic Newcastle disease virus isolates in Korea
2012
Kim, J.H., Seoul National University, Seoul, Republic of Korea | Sung, H.W., Kangwon National University, Chuncheon, Republic of Korea | Kim, I.H., Seoul National University, Seoul, Republic of Korea | Lee, E.K., Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang, Republic of Korea | Choi, K.S., Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang, Republic of Korea | King, Daniel Jack, Southeast Poultry Research Laboratory, USDA-ARS, Athens, GA, USA
A total of 18 Newcastle disease virus (NDV) isolates that were recovered from 1949 through 1997 were characterized and pathotyped. All viruses were highly virulent as determined by intracerebral pathogenicity indices greater-than or equal to 1.81 in day-old. These pathotypes are typical for viscerotropic velogenic NDV (VVNDV) pathotype viruses. Some differences were observed for the chicken red blood cell elution rate and thermostability of the hemagglutinin at 56℃. Three antigenic groups were identified by a hemagglutination-inhibition assay using NDV monoclonal antibodies. And the predominant gross lesions were as follows: discharge from the nasal cavity, tracheal mucus, petechial hemorrhage in the heart fat, kidney urates and hemorrhage with or without necrosis in the gastrointestinal tract. Severe hemorrhagic or necrotic lesions were also noted in the lymphoid organs and were localized primarily in the spleen and cecal tonsil. However, differences in the occurrence and frequency of the gross lesions were observed between the virus strains. Among them, NDV strains that induced neurological symptoms belonged only to genotype Ⅵ. This strain had spread throughout Korea during the late 1980s to the 1990s, which suggests that specific VVNDVs genotypes might result in neurological symptoms.
Afficher plus [+] Moins [-]Characterization of Yersinia ruckeri isolated from the farm-cultured eel Anguilla japonica in Korea
2010
Joh, S.J., National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Kweon, C.H., National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Kim, M.J., National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Kang, M.S., National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Jang, H., National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Kwon, J.H., National Veterinary Research and Quarantine Service, Anyang, Republic of Korea
Yersinia (Y.) ruckeri has been recognized as a serious bacterial pathogen to several kinds of fish, including rainbow trout. However, there are no reports about the characteristics and pathogenicity of Y. ruckeri isolated from farm-cultured eels. In this study, we isolated and characterized Y. ruckeri from the farm-cultured eel Anguilla japonica in Korea. We investigated the phenotypic and genotypic characteristics of Y. ruckeri and tested the virulence of Y. ruckeri isolates on experimentally infected eels. Examination of the flagellar morphology of Y. ruckeri by electron microscopy showed peritrichous flagella in its cell body. Biochemical reaction studies showed overall identical profiles between the isolates and the reference strain of Y. ruckeri in API 20E and API ZYM tests. We sequenced the 16S rRNA of the Y. ruckeri (1,505 bp) for the genotypic characterization (National Center for Biotechnology Information accession number EU401667). Comparison of the 16S rRNA sequences with previously reported Y. ruckeri strains revealed similar phylogenetic relationships. In the virulence assay of the Y. ruckeri on eels, the eels exhibited listlessness, but Y. ruckeri was reisolated from those of the gills and kidneys.
Afficher plus [+] Moins [-]Effects of gamma-irradiation from cobalt-60 on pathogenicity of Eimeria tenella
1993
Youn, H.J. | Kang, Y.B. (Rural Development Administration, Anyang (Korea Republic). Veterinary Research Institute) | Jang, D.H. (Seoul National University, Seoul (Korea Republic). College of Veterinary Medicine)