Abstract
BackgroundNewcastle disease virus represents APMV-1 and is the most characterized among all APMV types. The F protein cleavage site sequence is a well-characterized determinant of NDV pathogenicity in chickens. In this study, the sequences of fusion protein (F) gene of three Newcastle disease virus (NDV) strains isolated from outbreak in chickens in the Al-Sharkia province of Egypt in 2006 were determined.FindingsThe viral genomic RNAs were extracted from the infective allantoic fluid and F gene is amplified using primer sets designed from the available sequences of NDV strains from GenBank. The pathogenicity of NDV strains was determined by three internationally recognized tests mean death time, intracerebral pathogenicity index, and intravenous pathogenicity index. The phylogenetic analysis showed that the Egypt isolates are closely related with the genotype II of class II NDV strains.ConclusionsThe sequences of the F genes of the 2006 Egypt isolates are closely related to that of the 2005 Egypt isolate from the same province suggesting that these strains are probably circulating in the vaccinated bird population in Egypt until development of an outbreak.
Highlights
Newcastle disease virus represents APMV-1 and is the most characterized among all APMV types
The sequences of the F genes of the 2006 Egypt isolates are closely related to that of the 2005 Egypt isolate from the same province suggesting that these strains are probably circulating in the vaccinated bird population in Egypt until development of an outbreak
Newcastle disease virus (NDV) isolates display a spectrum of virulence in chickens ranging from inapparent to fatal infection
Summary
Newcastle disease virus represents APMV-1 and is the most characterized among all APMV types. Conclusions: The sequences of the F genes of the 2006 Egypt isolates are closely related to that of the 2005 Egypt isolate from the same province suggesting that these strains are probably circulating in the vaccinated bird population in Egypt until development of an outbreak. * Correspondence: ssamal@umd.edu 2Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, College Park, MD 20742, USA Full list of author information is available at the end of the article of many North American NDV strains are available; very little is known about the genome sequences of NDV strains isolated from different parts of Africa with in isolated cases [2,3,4].
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