resistance of fasciola hepatica against triclabendazole in cattle in patagonia (argentina).in the winter of 2008, cattle on a farm in the province of neuquen, argentina died from subacute and chronic liver fluke disease despite four previous treatments with triclabendazole (tcbz). in the spring of 2009, a preliminary efficacy test revealed good performance using nitroxynil, whereas tcbz efficacy was only 18% by egg counts of fasciola eggs in the faeces. resistance to fasciola hepatica to tcbz has never been reported in south america, so in january of 2010 a controlled trial was conduc ...201121277090
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