Deadly screwworm fly resurfaces in US cattle after 60 years

Screwfly can rarely infest humans; authorities urge immediate medical attention for suspicious lesions.

After six decades of absence, the screwworm fly has returned to American soil, detected in two young calves in Zavala County, Texas in early June 2026. This parasite — unlike most of its kind — consumes living flesh, turning minor wounds into mortal threats, and its reappearance arrives at a moment when the national cattle herd is already at its most diminished in three-quarters of a century. Authorities had foreseen this crossing and claim readiness, deploying sterile flies and quarantine zones in a race that will test whether past victories over this pest can be repeated. The return of the s

Deadly screwworm fly resurfaces in US cattle after 60 years

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