FDA approves Merck drug for decimated U.S. cattle herds to stop screwworm

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U.S. cattle ranchers will soon have a new way to protect their dwindling herds from the threat of the parasite screwworm, which is decimating cattle in Mexico.

The U.S. Food and Drug Administration granted conditional approval for a drug called EXZOLT CATTLE-CA1, a topical treatment from Merck

Animal Health for the prevention and treatment of New World Screwworm. It can also be used as a treatment and control for the cattle fever tick.

Farmers will have access to doses of the Merck drug starting on December 20 through their veterinarian.