No signs of emerging New World screwworm threat in WA

By: Aspen Ford

Outlets: Washington State Standard

Published: June 17, 2026

Words: 506

Last Updated: 1 month ago

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A parasitic fly that poses a deadly threat to livestock and pets has re-invaded the United States for the first time since 1968.

Washington state agriculture officials say it’s unlikely that the New World screwworm will spread here. It doesn’t thrive in colder climates, and the state recently implemented new inspection requirements to help keep the flies out.

The screwworm feeds on the tissue of warm-blooded animals and “screws” open a wound in flesh …

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