Publication Type
Journal Article
Publication Date (Issue Year)
2024
Journal Name
Discover Animals
Abstract
Background
Newcastle disease (ND) is a viral disease affecting a wide range of bird species and has a considerable financial impact on the world's poultry market. The ND virus (NDV) strains currently circulating in poultry throughout Africa, and especially in East Africa, exhibit significant genetic variation.
Objectives
The primary objective of the present investigation was to investigate the NDV genotypes in chickens raised in backyards in Tanzania's Morogoro and Iringa districts, which were associated with ND outbreaks.
Methods
Two tissue samples from chickens taken during a suspected ND outbreak in Tanzania's Morogoro (Eastern zone) and Iringa (Southern highlands zone) were subjected to reverse transcription polymerase chain reaction targeting the fusion (F) and hemagglutinin-neuraminidase (HN) genes, followed by sequencing.
Results
Based on comprehensive analysis of the entire F and HN gene sequences, the viruses were categorized as genotype VII and displayed significant genetic similarity with NDV strains previously identified in Mozambique, South Africa, Zambia, Zimbabwe, Botswana, Southeast Asia, and China. The uniformity in the amino acid cleavage site motif of the F protein across the examined NDV isolates, characterized by 112R–R–Q/K–K–R–F117, indicates their classification as virulent strains.
Conclusion
Regularly characterizing circulating strains and expanding the study to other parts of Tanzania may help to enhance disease control by giving a more precise picture of the situation regarding ND, especially in light of the issues posed by NDV genotype VII elsewhere.
Keywords
Newcastle disease, Newcastle disease virus, Genotypes, Virulence, Phylogeography, Africa
Rsif Scholar Name
Charlie Frank Arthur N'guessan Amoia
Thematic Area
Food security and Agribusiness
Africa Host University (AHU)
Sokoine University of Agriculture (SUA), Tanzania
Funding Statement
C.FA. was awarded a Regional Scholarship and Innovation Fund (RSIF), through the Partnership for Skills in Applied Sciences, Engineering and Technology (PASET) in order to complete doctoral studies at SACIDS Africa Centre of Excellence for Infectious Diseases, SACIDS Foundation for One Health, Sokoine University of Agriculture, Morogoro, Tanzania. South African National Research Foundation (NRF) and Tanzania Commission for Science and Technology (COSTECH) have jointly funded G.M's OR Tambo Africa Research Chair for Viral Epidemics.
Recommended Citation
Amoia, C. F., Hakizimana, J. N., Chengula, A. A., Makange, M. R., Weger-Lucarelli, J., & Misinzo, G. (2024). Phylogenetic analysis of virulent strains of the Newcastle disease virus isolated from deceased chickens in Tanzania’s Morogoro and Iringa regions. Discover Animals, 1 (1), 1-11. https://doi.org/10.1007/s44338-024-00015-0