Flesh-eating screwworm is spreading in the US, threatening livestock and wildlife – hunters can be the first line of defense

Over 120 screwworm cases have appeared in US animals in 2026, including in elk. Here’s how America’s 11.5 million hunters can help contain the spread.

By: Jacob Dykes, Mississippi State University and Eric Michel, Mississippi State University, The Conversation

Outlets: The Conversation

Published: November 6, 2026

Words: 1,292

Last Updated: 10 hours, 53 minutes ago

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By Jacob Dykes, Mississippi State University and Eric Michel, Mississippi State University

For the first time in over 50 years, an infestation of the flesh-eating fly known as the New World screwworm (Cochliomyia hominivorax) is spreading on the U.S. mainland, and it is putting livestock and other animals at risk.

The New World screwworm doesn’t just attack cattle. All warm-blooded animals are susceptible, including deer and elk, as well as small game, waterfowl and pets.

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