epizootiology of fascioliasis in montana.during 1989-1990, the united states department of agriculture (usda) meat inspection records were used to determine the distribution and incidence of liver flukes (fasciola hepatica and fascioloides magna) in montana cattle. of the cows and bulls slaughtered in usda-inspected packing plants during a 12 month time period, 17.24% had livers that were condemned because of liver flukes. this was a 12% increase over usda liver condemnations reported for 1973. infected animals have been reported from ...19921496783
distribution of potential intermediate hosts for fasciola hepatica and fascioloides magna in montana, usa.a collection of lymnaeid snails in montana was made over a 3 year period, in conjunction with a state-wide survey of the distribution of liver flukes in montana. collection areas were selected based on reports of infected cattle, sheep or wildlife, and with the intent of covering all geographic regions of the state. snails were found at all 97 of the locations chosen for collections, with lymnaeids collected at 71 of the locations. the 97 sites were located in 28 of montana's 56 counties. nine l ...19968638394
seasonal transmission of fasciola hepatica in montana, usa, with detection of infected intermediate hosts using a dna-based assay.a cashmere goat ranch in the beaverhead valley, southwest montana, usa reported acute fasciolosis in march 1992. the ranch was used as a study site to gather seasonal transmission data for the liver fluke, fasciola hepatica. testing of snails for infection with a nucleic acid-based assay, and use of tracer sheep at the site has shown the seasonal transmission of the parasite is only in late autumn. the snail responsible for transmission was identified as lymnaea modicella although another known ...19968983156
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