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Open Access Short report

Sequence analysis of fusion protein gene of Newcastle disease virus isolated from outbreaks in Egypt during 2006

Mahmoud HA Mohamed1, Sachin Kumar2, Anandan Paldurai2 and Siba K Samal2*

Author Affiliations

1 Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt

2 Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, College Park, MD 20742, USA

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Virology Journal 2011, 8:237  doi:10.1186/1743-422X-8-237

Published: 18 May 2011

Abstract

Background

Newcastle 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.

Findings

The 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.

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.

Keywords:
Newcastle; disease virus; African strain; Chickens; Sequence