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Molecular characterization of Cysticercus tenuicollis isolates from sheep in the Nile Delta, Egypt and a review on Taenia hydatigena infections worldwide

Published online by Cambridge University Press:  29 March 2021

Ibrahim Abbas Open the ORCID record for Ibrahim Abbas [Opens in a new window] ,
El-Sayed El-Alfy ,
Elisabeth Janecek-Erfurth  and
Christina Strube Open the ORCID record for Christina Strube [Opens in a new window]
Ibrahim Abbas*
Affiliation:
Parasitology Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura35516, Egypt
El-Sayed El-Alfy
Affiliation:
Parasitology Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura35516, Egypt
Elisabeth Janecek-Erfurth
Affiliation:
Institute for Parasitology, Center for Infection Medicine, University of Veterinary Medicine Hannover, Buenteweg 17, 30559Hanover, Germany
Christina Strube
Affiliation:
Institute for Parasitology, Center for Infection Medicine, University of Veterinary Medicine Hannover, Buenteweg 17, 30559Hanover, Germany
*
Author for correspondence: Ibrahim Abbas, E-mail: [email protected]
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Abstract

The predator–prey-transmitted cestode Taenia hydatigena infects a wide range of definitive and intermediate hosts all over the world. Domestic and sylvatic cycles of transmission are considered as well. The parasite has considerable economic importance, particularly in sheep. Here, the molecular characters of T. hydatigena cysticerci in sheep from the Nile Delta, Egypt were investigated for the first time. For this purpose, 200 sheep carcasses and their offal were inspected at the municipal abattoir, Dakahlia governorate, Egypt. Cysticerci of T. hydatigena were collected and molecularly characterized employing the mitochondrial 12S rRNA gene. Cysticerci were found in 42 (21%) sheep, mostly attached to the omenti, mesenteries and livers. After molecular confirmation, nine isolates were sequenced displaying six different haplotypes. Analysis of the T. hydatigena 12S rRNA nucleotide sequences deposited in GenBank revealed 55 haplotypes out of 69 isolates, displaying high haplotype (0.797) and low nucleotide (0.00739) diversities. For the Tajima D neutrality index, a negative value (−2.702) was determined, indicating the population expansion of the parasite. Additionally, global data summarized in this study should be useful to set up effective control strategies against this ubiquitous parasite.

Keywords

12S rRNACysticercus tenuicollisEgyptglobal distributionsheepTaenia hydatigena
Type
Research Article
Information
Parasitology , Volume 148 , Issue 8 , July 2021 , pp. 913 - 933
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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Footnotes

*

Current address: Institute for Experimental Infection Research, TWINCORE, Centre for Experimental and Clinical Infection Research, a joint venture between the Hanover Medical School and the Helmholtz Centre for Infection Research, Hanover, Germany

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