Experimental Fascioliasis in Australia
1969; Elsevier BV; Linguagem: Inglês
10.1016/s0065-308x(08)60435-2
ISSN2163-6079
Autores Tópico(s)Mollusks and Parasites Studies
ResumoA number of studies have been made on the variation in morphology of fluke-host snails, apart from the problem of taxonomy. In order to clarify the taxonomy of these snails, a study was made of 61 populations from 42 localities in New South Wales, South Australia, Queensland, Victoria and Tasmania, and some specimens forwarded by several collaborators in New Zealand. Two extreme morphological types, “A” and “B,” were recognized, and both serve as intermediate hosts for F.hepatica. Snails collected in the field showed great variations in shell and body and there were many intermediates between the extreme variants. In the assessment of various factors influencing the epidemiology and control of fascioliasis because of F. hepatica or F. gigantica, it should be assumed that all lymnaeid snails may aestivate for a considerable time during dry periods at both low and high temperatures. Empirical screening for new and more efficient anthelmintics against F. hepatica has been fairly successful, but has still failed to produce the ideal drug for safe, economic, and preventive medication of fascioliasis. More knowledge on the intermediary metabolism of F. hepatica, particularly of enzyme activity in the pathways, may lead to a new revolutionary approach for selecting a substance for the elimination of the parasites.
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