A long forgotten foe is beginning to reemerge on pastures and meadows around the world, and farmers are finding that they have no way to combat it. Parasitic worms infecting cows, sheep, goats and horses are becoming resistant to the drugs used to kill them. If changes are not made in how the few remaining drugs that still work are used, there may be no way left to fight the growing threat, according to Ray Kaplan, a Univ. of Georgia professor in the department of infectious diseases.
Kaplan has studied drug-resistant parasites for years and his findings, recently published in the journal Veterinary Parasitology, warn that the continued overuse of deworming drugs has the potential to create parasites that cannot be killed.
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