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Originalmente publicado por saschia
Well, I can imagine multi-drug resistance in cancer cells and in bacteria, but in dogs???
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Unfortunately Australian Shepherds are in my experience the breed with the highest incidence of MDR1 mutation. Chemicals commonly found in heartworm preventatives can be dangerous when applied on dogs with MDR1 mutations (along with other chemicals). Lots of Aussie owners we know purposely stay away from medications with Ivermectin in it, even if they have not tested the specific dogs for MDR1 mutation.