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2 results on '"Gert E. Olsson"'

1. First identification of Echinococcus multilocularis in rodent intermediate hosts in Sweden

Author

Andrea L. Miller, Gert E. Olsson, Marion R. Walburg, Sofia Sollenberg, Moa Skarin, Cecilia Ley, Helene Wahlström, and Johan Höglund

Subjects
Echinococcus multilocularis, Arvicola amphibius, Microtus agrestis, Intermediate host, Sweden, Rodent, Zoology, QL1-991
Abstract

Echinococcus multilocularis is a zoonotic tapeworm with a sylvatic lifecycle and an expanding range in Europe. Monitoring efforts following its first identification in 2011 in Sweden have focused on the parasite's definitive host, the red fox (Vulpes vulpes). However, identifying rodent intermediate hosts is important to recognize opportunities for parasite transmission. During 2013–2015, livers from a total of 1566 rodents from four regions in Sweden were examined for E. multilocularis metacestode lesions. Species identity of suspect parasite lesions was confirmed by PCR and sequencing. E. multilocularis positive lesions >6 mm in diameter were also examined histologically. One Microtus agrestis out of 187 (0.5%, 95%CI: 0–2.9%), 8/439 (1.8%, 95%CI: 0.8–3.6%) Arvicola amphibius, 0/655 (0%, 95%CI: 0–0.6%) Myodes glareolus, and 0/285 (0%, 95%CI: 0–1.3%) Apodemus spp. contained E. multilocularis metacestode lesions. Presence of protoscoleces was confirmed in the infected M. agrestis and in three of eight infected A. amphibius. Six of the nine positive rodents were captured from the same field. This is the first report of E. multilocularis in intermediate hosts in Sweden. The cluster of positive rodents in one field shows that local parasite prevalence can be high in Sweden despite overall low national prevalence in foxes (

Published
2016
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2. Reappraisal of Hydatigera taeniaeformis (Batsch, 1786) (Cestoda: Taeniidae) sensu lato with description of Hydatigera kamiyai n. sp

Author

Takashi Iwaki, A. V. Krivopalov, Andrea Galimberti, Gert E. Olsson, Yitagele Terefe, Minoru Nakao, Tadashi Itagaki, Ali Halajian, Heikki Henttonen, Madoka Ichikawa-Seki, Voitto Haukisalmi, Nikolai E. Dokuchaev, Serge Morand, Seppo Meri, Anu Näreaho, Sergey V. Konyaev, Alexis Ribas, Antti Lavikainen, Maurizio Casiraghi, Lavikainen, A, Iwaki, T, Haukisalmi, V, Konyaev, S, Casiraghi, M, Dokuchaev, N, Galimberti, A, Halajian, A, Henttonen, H, Ichikawa Seki, M, Itagaki, T, Krivopalov, A, Meri, S, Morand, S, Näreaho, A, Olsson, G, Ribas, A, Terefe, Y, Nakao, M, Medicum, Department of Bacteriology and Immunology, Immunobiology Research Program, Research Programs Unit, Finnish Museum of Natural History, Zoology, Seppo Meri / Principal Investigator, Departments of Faculty of Veterinary Medicine, Veterinary Biosciences, Veterinary Pathology and Parasitology, and Antti Sukura / Principal Investigator

Subjects
0301 basic medicine, Phylogénie, Identification, Felidae, MITOCHONDRIAL-DNA, Lineage (evolution), ADN, DIVERSITY, Hydatigera kamiyai n. sp, Cytochrome c oxydase, Cat Diseases, 413 Veterinary science, DNA barcoding, Hôte, Rodent Diseases, Mice, MULTIPLE SEQUENCE ALIGNMENT, Génétique des populations, Zoonosi, Zoonoses, Hydatigera taeniaeformis, Phylogeny, HYPOTHESIS, biology, Arvicolinae, Parasitologia, DNA, Helminth, 030108 mycology & parasitology, Cestode Infections, Mitochondria, Europe, Phylogeography, Infectious Diseases, Provenance, Cryptic species, MOLECULAR-IDENTIFICATION, L72 - Organismes nuisibles des animaux, Species complex, Séquence nucléotidique, Asia, RATTUS-NORVEGICUS, Paràsits, Distribution géographique, Cestoda, Zoology, GENUS ECHINOCOCCUS, Electron Transport Complex IV, 03 medical and health sciences, Sensu, Phylogenetics, Animals, DNA Barcoding, Taxonomic, Parasites, Cryptic specie, FAMILY TAENIIDAE, Taenia, Australia, L60 - Taxonomie et géographie animales, Bayes Theorem, Taxonomie, biology.organism_classification, Hydatigera taeniaeformi, Rats, Genetic divergence, INTRASPECIFIC VARIATION, 030104 developmental biology, Chat, Taeniidae, Africa, Cats, Parasitology, Murinae, 3111 Biomedicine, TAXONOMIC REVISION
Abstract

The common cat tapeworm Hydatigera taeniaeformis is a complex of three morphologically cryptic entities, which can be differentiated genetically. To clarify the biogeography and the host spectrum of the cryptic lineages, 150 specimens of H. taeniaeformis in various definitive and intermediate hosts from Eurasia, Africa and Australia were identified with DNA barcoding using partial mitochondrial cytochrome c oxidase subunit 1 gene sequences and compared with previously published data. Additional phylogenetic analyses of selected isolates were performed using nuclear DNA and mitochondrial genome sequences. Based on molecular data and morphological analysis, Hydatigera kamiyai n. sp. Iwaki is proposed for a cryptic lineage, which is predominantly northern Eurasian and uses mainly arvicoline rodents (voles) and mice of the genus Apodemus as intermediate hosts. Hydatigera taeniaeformis sensu stricto (s.s.) is restricted to murine rodents (rats and mice) as intermediate hosts. It probably originates from Asia but has spread worldwide. Despite remarkable genetic divergence between H. taeniaeformis s.s. and H. kamiyai, interspecific morphological differences are evident only in dimensions of rostellar hooks. The third cryptic lineage is closely related to H. kamiyai, but its taxonomic status remains unresolved due to limited morphological, molecular, biogeographical and ecological data. This Hydatigera sp. is confined to the Mediterranean and its intermediate hosts are unknown. Further studies are needed to classify Hydatigera sp. either as a distinct species or a variant of H. kamiyai. According to previously published limited data, all three entities occur in the Americas, probably due to human-mediated introductions. (C) 2016 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved.

Published
2016

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