Beneficial organisms react differently to parasite drug

The substance ivermectin has been used for more than thirty years all over the world to combat parasites like roundworms, lice and mites in humans, livestock and pets. The active ingredient belongs to the chemical group of avermectins, which generally disrupt cell transport and thus attack pests. When ivermectin is excreted in the feces of treated animals, at overly high doses it also harms dung-degrading beneficial insects like dung beetles and dung flies. This impairs the functioning of the ecosystem. In extreme cases the dung is not decomposed and the pasture is destroyed.

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