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Impact of overgrazing on the transmission of Echinococcus multilocularis in tibetan pastoral communities of Sichuan Province,China

引用

Chinese Medical Journal 2007年第3期120卷 237-242页

作者： WANG Qian XIAO Yong-fu Dominique A Vuitton Peter M Schantz Francis Raoul Christine Budke Maiza Campos-Ponce Philip S Craig Patrick Giraudoux Sichuan Centre for Disease Control and Prevention Chengdu610041 China WHO Collaborating Centre for the Prevention and Treatment ofAlveolar Echinococcosis SERF and LBE Usc INRA ResearchUnits University of Franche-Comte 25030-Besancon France Institute of Parasitology University of Zurich Winterthurerstrasse266a CH-8057 Zurich Switzerland Faculty of Earth and Life Sciences Free University AmsterdamNetherlands Cestode Zoonoses Research Group Bioscience Research Instituteand School of Environment and Life Sciences University ofSalford Salford MS4WT United Kingdom

Background Overgrazing was assumed to increase the population density of small mammals that are the intermediate hosts of Echinococcus multilocularis, the pathogen of alveolar echinococcosis in the Qinghai Tibet Plateau. This research tested the hypothesis that overgrazing might promote Echinococcus multilocularis transmission through increasing populations of small mammal, intermediate hosts in tibetan pastoral communities. Methods Grazing practices, small mammal indices and dog Echinococcus multilocularis infection data were collected to analyze the relation between overgrazing and Echinococcus multilocularis transmission using nonparametric tests and multiple stepwise logistic regression. Results In the investigated area, raising livestock was a key industry. The communal pastures existed and the available forage was deficient for grazing. Open （common） pastures were overgrazed and had higher burrow density of small mammals compared with neighboring fenced （private） pastures; this high overgrazing pressure on the open pastures measured by neighboring fenced area led to higher burrow density of small mammals in open pastures. The median burrow density of small mammals in open pastures was independently associated with nearby canine Echinococcus multilocularis infection （P=-0.003, OR=1.048）. Conclusion Overgrazing may promote the transmission of Echinococcus multilocularis through increasing the population density of small mammals.

关键词： echinococcosis, hepatic Echinococcus multilocularis overgrazing tibetan pastoral communities

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