Genetic Diversity of Rabies Virus in Different Host Species and Geographic Regions of Zambia and Zimbabwe

Overview

Journal Virus Genes

Specialties Microbiology
Molecular Biology

Date 2019 Jul 4

PMID 31267444

Citations 8

Authors

Walter Muleya

Herman Moses Chambaro

Michihito Sasaki

Lambert Fadzai Gwenhure

Roy Mwenechanya

Masahiro Kajihara

Ngonda Saasa

Zacharia Mupila

Akina Mori-Kajihara

Yongjin Qiu

Elias Kangwa

Aaron Mweene

Boniface Namangala

Ayato Takada

Hirofumi Sawa

Affiliations

Soon will be listed here.

Abstract

Rabies is endemic in Zambia and Zimbabwe. The previously investigated strains of rabies virus in central Zambia belong to the Africa 1b lineage, with similar circulating virus strains found in the various tested hosts and regions. However, prior work assessed only limited regions and host species. Thus, this study aimed to more comprehensively determine the genetic diversity of rabies virus across regions of Zambia and Zimbabwe. RNA (n = 76) was extracted from positive direct fluorescent antibody test brain tissues from dog, cow, goat, cat, pig, human, and jackal collected from Zambia and Zimbabwe. The amplicons of the nucleoprotein and glycoprotein genes were obtained from all examined samples by nested RT-PCR and subsequently sequenced. A phylogenetic analysis of the N gene confirmed that all the endemic strains of rabies virus in Zambia and Zimbabwe belong to the Africa 1b lineage. The obtained viral gene sequences were phylogenetically divided into two clusters. Cluster II comprised only Zambian strains. In contrast, cluster I comprised both Zambia and Zimbabwe strains, with strains from Zimbabwe forming a distinct lineage from Zambian strains, implying viral genetic divergence due to geographical barriers. However, no evidence of clustering based on host or region was observed, implying the circulation of similar virus strains occurs in different hosts and regions of Zambia and Zimbabwe. The clustering of rabies virus strains from jackals with those from domestic animals provides evidence of similar virus strains circulating in both wildlife and domestic animals, and that the jackal might be one of the potential reservoirs of rabies virus infection. In this study, no strains circulating in Zimbabwe were detected in Zambia.

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