Home â–¶ Vol 79, No 2 (2012) â–¶ Kasanga

Article Information Authors: Christopher J. Kasanga1 T. Yamaguchi2 H.M. Munang’andu3 P.N. Wambura1 K. Ohya4 H. Fukushi4 Affiliations: 1Department of Veterinary Microbiology and Parasitology, Sokoine University of Agriculture, Tanzania 2Faculty of Agriculture, Tottori University, Japan 3Department of Paraclinical Sciences, University of Zambia, Zambia 4Faculty of Applied Biological Sciences, Gifu University, Japan Correspondence to: Christopher Kasanga Postal address: PO Box 3019, Chuo kikuu, Morogoro, Tanzania How to cite this abstract: Kasanga, C.J., Yamaguchi, T., Munang’andu, H.M., Wambura, P.N., Ohya, K. & Fukushi, H., 2012, ‘Genomic sequence of infectious bursal disease virus from Zambia suggests evidence for genome re-assortment in nature’, Onderstepoort Journal of Veterinary Research 79(2), Art. #473, 1 page. http://dx.doi.org/10.4102/ ojvr.v79i2.473 Note: Proceedings of the Conference of the Southern African Centre for Infectious Disease Surveillance ‘One Health’ held at the National Institute for Communicable Diseases, Johannesburg, July 2011. Copyright Notice: © 2012. The Authors. Licensee: AOSIS OpenJournals. This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Genomic sequence of infectious bursal disease virus from Zambia suggests evidence for genome re-assortment in nature In This Abstract... Open Access Infectious bursal disease virus (IBDV) is a bi-segmented RNA virus, which belongs to the genus Avibirnavirus of the family Birnaviridae. Two serotypes, 1 and 2, exist in IBDV. The serotype 1 IBDVs are the causative agents of infectious bursal disease (IBD) in chickens worldwide and lead to immunosuppression in young birds. Genome re-assortment has been speculated to occur and contribute to the emergence of new IBDV strains. However, evidence was lacking until recently when two re-assortant viruses were detected in China. In this study, we determined the complete nucleotide sequence of an IBDV, designated KZC-104, from a confirmed natural IBD outbreak in Lusaka, Zambia in 2004. The genome consisted of 3074 and 2651 nucleotides in the coding regions of segments A and B, respectively. Alignment of both nucleotide and deduced amino acid sequences, and phylogenetic analysis revealed that the genome segment A of KZC-104 was derived from a very virulent strain, whereas its segment B was derived from a classical attenuated strain. On BLAST search, the full-length segments A and B sequences showed 98% closest nucleotide homology to the very virulent strain D6948 and 99.8% closest nucleotide homology to the classical attenuated strain D78, respectively. This is a unique IBDV reassortant strain, which has emerged in nature involving segment B of a live attenuated vaccine. This observation provides direct evidence for the involvement of vaccine strains in the emergence of reassortant IBDV in the field. Taken together, these findings suggest an additional risk of using live IBDV vaccines, which may act as genetic donors for genome re-assortment. Further studies are required to investigate the epidemiology and biological characteristics of reassortant strains so that the appropriate and safe IBDV vaccines can be recommended.

 

1. Molecular characterization of infectious bursal disease viruses detected in vaccinated commercial broiler flocks in Lusaka, Zambia
Kunda Ndashe, Edgar Simulundu, Bernard M Hang’ombe, Ladslav Moonga, Hirohito Ogawa, Ayato Takada, Aaron S Mweene
Archives of Virology  vol: 161  issue: 3  first page: 513  year: 2016  
doi: 10.1007/s00705-015-2690-x