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Seasonal change of Lymnaeid snails intermediate host of Fasciola gigantica in North and Central Vietnam
Bui Thi, Dung; Dang Tat, The; Pham Ngoc, Doanh et al.
2012Joint International Tropical Medicine Meeting 2012, The 7th Seminar on Food- and Water-Borne Parasitic Zoonoses
 

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Keywords :
Lymnaeid; Fasciola gigantica; Vietnam
Abstract :
[en] Objective: The present study was undertaken to investigate the population dynamics of the intermediate hosts of Fasciola gigantica and the levels of infection in the snails. This would allow identifying the most important transmission periods and suggesting optimal snail control for the area. Methods: Lymnaeid snails were monthly collected by hand picking in Ha Noi (Northern Vietnam) during the period from March 2010 to December 2011 and in Binh Dinh province (Central Vietnam) during the period May and September 2012. Collected snails from different sites were identified based on morphology and the partial 16S rDNA sequence and ITS-2 sequence. Snails were examined for the presence of Fasciola larval by the crushing method and confirmation by multiplex PCR analyses with PCR primer for Fasciola gigantica cathepsin L in parallel with the snail rDNA species specific primer. Result: The density of Lymnaeid populations underwent great changes in relation to the geographical locations and seasons. In Central Vietnam, the Lymnaeid populations reached the peak in the dry/rainy season (May) and decreased sharply in rainy/dry season (September). In contrast, in Hanoi, it reached the peaks in 2 periods (February to April and August to November) of rice cultivation or early stage of growing of rice, and greatly deceased when the rice becomes fully developed. Transmission of fascioliasis in Ha Noi were high when rice cultivation is performed, while the permanent transmission can takes place through the year in Binh Dinh with peak transmission during the dry season.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Bui Thi, Dung ;  Université de Liège - ULiège > Doct. sc. vété. (Bologne)
Dang Tat, The
Pham Ngoc, Doanh
Losson, Bertrand ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires > Parasitologie et pathologie des maladies parasitaires
Saegerman, Claude  ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires > Epidémiologie et analyse des risques appl. aux sc. vétér.
Language :
English
Title :
Seasonal change of Lymnaeid snails intermediate host of Fasciola gigantica in North and Central Vietnam
Publication date :
December 2012
Number of pages :
89
Event name :
Joint International Tropical Medicine Meeting 2012, The 7th Seminar on Food- and Water-Borne Parasitic Zoonoses
Event organizer :
University of Mahidol
Event place :
Bangkok, Thailand
Event date :
from 12-12-2013 to 14-12-2013
Audience :
International
Available on ORBi :
since 08 May 2013

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