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Volume 19, supplement >

ON THE ECOLOGY AND DISTRIBUTION OF ECHINOCOCCUS SPP.(CESTODA : TAENIIDAE), AND CHARACTERISTICS OF THEIR DEVELOPMENT IN THE INTERMEDIATE HOST : II. COMPARATIVE STUDIES ON THE DEVELOPMENT OF LARVAL E. MULTILOCULARIS LEUCKART, 1863,IN THE INTERMEDIATE HOST

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/jjvr.19.suppl.1

Title: ON THE ECOLOGY AND DISTRIBUTION OF ECHINOCOCCUS SPP.(CESTODA : TAENIIDAE), AND CHARACTERISTICS OF THEIR DEVELOPMENT IN THE INTERMEDIATE HOST : II. COMPARATIVE STUDIES ON THE DEVELOPMENT OF LARVAL E. MULTILOCULARIS LEUCKART, 1863,IN THE INTERMEDIATE HOST
Authors: OHBAYASHI, Masashi Browse this author
RAUSCH, Robert L. Browse this author
FAY, Francis H. Browse this author
Issue Date: Jul-1971
Publisher: The Graduate School of Veterinary Medicine
Journal Title: Japanese Journal of Veterinary Research
Volume: 19
Issue: supplement
Start Page: 1
End Page: 53
Abstract: This paper reports the results of a comparative study of the development of the larval Echinococcus multilocularis LEUCKART, 1863,and associated tissue reaction in naturally and experimentally infected mammals representing 31 species. The histogenesis of the larval cestode was traced in detail in arvicoline rodents of several species, and interspecific differences were defined. In arvicoline rodents, the developing larva exhibited host-specific characteristics within about a month after infection was established. The tissue reaction in Microtus oeconomus was characterized by the production of a large quantity of detritus around the larva, and by the formation of a thick epithelioid zone. In one subspecies, M. oeconomus innuitus, development of the larva was retarded, and the detrital mass was often calcified ; in another, M. oeconomus operarius, the detritus rarely became calcified and the larva proliferated more rapidly. In M. pennsylvanicus, the tissue reaction was minimal, and little detritus was present. The characteristics of the tissue reaction in M. montebelli placed it in an intermediate position between the aforementioned species. In Clethrionomys rutilus, a thin epithelioid zone and an outer zone of loose collagenous fibers composed the adventitial layer ; exogenous budding was retarded in this vole. A minimal tissue reaction occurred in Lagurus curtatus. In Lemmus spp., larger cysts were characteristic, but areas of small-cystic proliferation were always present. Similar differences in species or subspecies of Citellus and Dicrostonyx were described. Lesions of alveolar hydatid disease in man also were studied. The invasive growth of the larval cestode in the human liver involves a process comparable to small-cystic proliferation in the natural intermediate hosts. Although the later stages of development of the larval cestode are inhibited in man, exogenous proliferation of vesicles continues for the life of the host. The lesion in man was compared with a morphologically similar formation produced by anomalous development of the larval E. granulosus in the bovine liver. The latter is distinguished by the absence of areas of small-cystic proliferation. Non-echinococcal lesions found in the tissues studied, some of which resembled foci caused by the larval E. multilocularis, were briefly discussed.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/1978
Appears in Collections:Japanese Journal of Veterinary Research > Volume 19, supplement

Submitter: 獣医学部図書室

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