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Characteristics of a NDV isolated from apparently healthy wild spot-billed ducks (Anas poecilorhyncha)
2008
Choi, K.S. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea), E-mail: choiks@nvrqs.go.kr | Lee, E.K. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Jeon, W.J. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Kwon, J.H. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea) | Yang, C.B. (National Veterinary Research and Quarantine Service, Anyang, Republic of Korea)
Newcastle disease virus (NDV) is the causative agent of a highly contagious and devastating Newcastle disease of poultry. A NDV (isolate DK1/07) was isolated from apparently healthy wild spot-billed ducks (Anas poecilorhyncha) captured at upper branch of the SapGyo Creek in Chungbuk province, Korea during early 2007. The DK1/07 isolate of minimum chicken embryo lethal dose killed all SPF chicken embryos within 60 h. The cleavage site of the F protein possessed the amino acid sequence ∨112R-R-Q-K-R-F∨117, which is a motif characteristic of virulent NDV strains. The F protein-based phylogenetic analysis revealed that the DK1/07 duck isolate was included in the cluster of genotype VIId and most closely related to recent NDV isolates obtained from chicken farms in Korea. Epidemiological importance of virulent NDV from wild duck is discussed.
Mostrar más [+] Menos [-]Characterization of pigeon paramyxoviruses (Newcastle disease virus) isolated in South Africa from 2001 to 2006
2008
Abolnik, C.(ARC-Onderstepoort Veterinary Institute) | Gerdes, G.H.(ARC-Onderstepoort Veterinary Institute) | Kitching, J.(Stellenbosch Provincial Veterinary Laboratory) | Swanepoel, S.(Deltammune Laboratorie) | Romito, M.(ARC-Onderstepoort Veterinary Institute) | Bisschop, S.P.R.(University of Pretoria Poultry Reference Laboratory)
Pigeon paramyxovirus type 1 (PPMV-1), a variant of Newcastle disease virus that primarily affects doves and pigeons has been isolated in South Africa since the mid-1980s. Phylogenetic evidence indicates that pigeon paramyxovirus type 1 viruses were introduced into South Africa on multiple occasions, based on the presence of two separate lineages, 4bi and 4bii, that have been circulating in Europe and the Far East since the early 1990s. During 2006, a PPMV-1 virus was isolated from an African ground hornbill (Bucorvus leadbeateri) which became acutely infected with PPMV-1 and died, probably after scavenging off infected dove carcasses in the region, since a closely-related PPMV-1 strain was also isolated from doves collected nearby. The hornbill isolate had ICPI and MDT values characteristic of PPMV-1 strains. The threat of PPMV-1 to poultry production and biodiversity in southern Africa highlights the importance of monitoring the spread of this strain.
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