Short Communication

Molecular epidemiology of infectious bursal disease virus in Zambia

Christopher J. Kasanga, Tsuyoshi Yamaguchi, Hetron M. Munang’andu, Kenji Ohya, Hideto Fukushi
Journal of the South African Veterinary Association | Vol 84, No 1 | a908 | DOI: https://doi.org/10.4102/jsava.v84i1.908 | © 2013 Christopher J. Kasanga, Tsuyoshi Yamaguchi, Hetron M. Munang’andu, Kenji Ohya, Hideto Fukushi | This work is licensed under CC Attribution 4.0
Submitted: 24 July 2012 | Published: 28 October 2013

About the author(s)

Christopher J. Kasanga, Department of Veterinary Microbiology and Parasitology, Sokoine University of Agriculture, Tanzania and Laboratory of Veterinary Microbiology, Gifu University, Japan
Tsuyoshi Yamaguchi, Avian Zoonoses Center, Tottori University, Japan
Hetron M. Munang’andu, Department of Paraclinical Sciences, University of Zambia, Zambia
Kenji Ohya, Laboratory of Veterinary Microbiology, Gifu University, Japan
Hideto Fukushi, Laboratory of Veterinary Microbiology, Gifu University, Japan


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Abstract

Nucleotide sequences of the VP2 hypervariable region (VP2-HVR) of 10 infectious bursal disease viruses detected in indigenous and exotic chickens in Zambia from 2004 to 2005 were determined. Phylogenetic analysis showed that the viruses diverged into two genotypes and belonged to the African very virulent types (VV1 and VV2). In the phylogenetic tree, strains in one genotype clustered in a distinct group and were closely related to some strains isolated in western Africa (VV1), with nucleotide similarities of 95.7%– 96.5%. Strains in the other genotype were clustered within the eastern African VV type (VV2), with nucleotide similarities of 97.3%– 98.5%. Both genotypes were distributed in the southern parts of Zambia and had a unique conserved amino acid substitution at 300 (E→A) in addition to the putative virulence marker at positions 222(A), 242(I), 256(I), 294(I) and 299(S). These findings represent the first documentation of the existence of the African VV-IBDV variants in both indigenous and exotic chickens in Zambia.

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