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Open Access Highly Accessed Research article

First Report on Circulation of Echinococcus ortleppi in the one Humped Camel (Camelus dromedaries), Sudan

Mohamed E Ahmed125, Kamal H Eltom14, Nasreen O Musa14, Ibtisam A Ali3, Fatima M Elamin1, Martin P Grobusch5 and Imadeldin E Aradaib1*

Author Affiliations

1 Molecular Biology Laboratory, Faculty of Veterinary Medicine, University of Khartoum, Khartoum, Republic of the Sudan

2 Department of Surgery, Faculty of Medicine, Al-Neelain University, Khartoum, Republic of the Sudan

3 Department of Internal Medicine, Faculty of Medicine, International University of Africa, Khartoum, Republic of the Sudan

4 Unit of Animal Health and Safety of Animal Products, Institute for Studies and Promotion of Animal Exports, University of Khartoum, Khartoum, Republic of the Sudan

5 Department of Infectious Diseases, Faculty of Medicine, Amsterdam Medical College, Amsterdam, The Netherlands

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BMC Veterinary Research 2013, 9:127  doi:10.1186/1746-6148-9-127

Published: 25 June 2013

Abstract

Background

Echinococcus granulosus (EG) complex, the cause of cystic echinococcosis (CE), infects humans and several other animal species worldwide and hence the disease is of public health importance. Ten genetic variants, or genotypes designated as (G1-G10), are distributed worldwide based on genetic diversity. The objective of this study was to provide some sequence data and phylogeny of EG isolates recovered from the Sudanese one-humped camel (Camelus dromedaries). Fifty samples of hydatid cysts were collected from the one- humped camels (Camelus dromedaries) at Taboul slaughter house, central Sudan. DNAs were extracted from protoscolices and/or associated germinal layers of hydatid cysts using a commercial kit. The mitochondrial NADH dehydrogenase subunit 1 (NADH1) gene and the cytochrome C oxidase subunit 1 (cox1) gene were used as targets for polymerase chain reaction (PCR) amplification. The PCR products were purified and partial sequences were generated. Sequences were further examined by sequence analysis and subsequent phylogeny to compare these sequences to those from known strains of EG circulating globally.

Results

The identity of the PCR products were confirmed as NADH1 and cox1 nucleotide sequences using the Basic Local Alignment Search Tool (BLAST) of NCBI (National Center for Biotechnology Information, Bethesda, MD). The phylogenetic analysis showed that 98% (n = 49) of the isolates clustered with Echinococcus canadensis genotype 6 (G6), whereas only one isolate (2%) clustered with Echinococcus ortleppi (G5).

Conclusions

This investigation expands on the existing sequence data generated from EG isolates recovered from camel in the Sudan. The circulation of the cattle genotype (G5) in the one-humped camel is reported here for the first time.

Keywords:
Echinococcus granulosus; NADH 1 gene; cox1 gene; Genotypes; Phylogenetic analysis, Sudan