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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
immunology and microbiology
A PCR system for detection of species and genotypes of the Echinococcus granulosus-complex, with reference to the epidemiological situation in eastern Africa
International Journal for Parasitology, Volume 34, No. 5, Year 2004
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Description
We describe the development of a specific and sensitive PCR/semi-nested PCR system for the rapid diagnosis of Echinococcus granulosus genotype G1, E. granulosus genotype G6/7, and Echinococcus ortleppi (G5). Diagnosis of G1 and the group G5/6/7 is performed by a simple PCR, while discrimination between E. ortleppi (G5) and G6/7 involves a subsequent semi-nested PCR step. The target sequence for amplification is part of the mitochondrial 12S rRNA gene. Specificity of the PCRs was 100% when evaluated with isolates of 16 species of cestodes, including Echinococcus multilocularis, Echinococcus equinus, E. ortleppi and three strains of E. granulosus (G1, G6 and G7). Sensitivity threshold was 0.25pg of DNA. This new approach was compared with published protocols of restriction fragment length polymorphism-PCR and sequencing of mitochondrial cytochrome c oxidase subunit 1 and NADH dehydrogenase 1 genes using Echinococcus isolates of human, sheep, goat, camel, cattle and pig origin from Kenya and Sudan. Additionally, two internal DNA probes were developed, one hybridising only with G1, the other with G5, G6 and G7 amplification products. Preliminary epidemiological results obtained with this PCR approach include the detection of a camel strain (G6) infection for the first time in a human patient from eastern Africa, and the first reports of E. ortleppi (G5) in livestock from Kenya and the Sudan. © 2004 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Dinkel, Anke
Germany, Stuttgart
Universität Hohenheim
Njoroge, Ernest M.
Kenya, Nairobi
Amref Health Africa
Zimmermann, Anja
Germany, Stuttgart
Universität Hohenheim
Wälz, Marcus
Germany, Stuttgart
Universität Hohenheim
Zeyhle, Eberhard E.
Kenya, Nairobi
Amref Health Africa
Elmahdi, Ibrahim E.
Sudan, Wad Medani
University of Gezira
MacKenstedt, Ute
Germany, Stuttgart
Universität Hohenheim
Römig, Thomas J.
Germany, Stuttgart
Universität Hohenheim
Statistics
Citations: 232
Authors: 8
Affiliations: 3
Identifiers
Doi:
10.1016/j.ijpara.2003.12.013
ISSN:
00207519
Research Areas
Genetics And Genomics
Health System And Policy
Study Locations
Kenya
Sudan