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Screwworms Back in U.S. Threatens Livestock

Screwworms Back in U.S. Threatens Livestock

Published 2 days, 13 hours ago
Description

A deadly parasite known as the New World screwworm has reappeared in the U.S., with confirmed cases in New Mexico and Texas affecting dogs, cattle, goats, and posing a serious threat to livestock and even humans. These flesh-eating maggots can burrow into wounds and cause fatal infections, forcing ranchers to rethink practices like branding and prompting emergency USDA interventions including ivermectin treatments. The outbreak threatens to spike beef and dairy prices, worsen existing supply chain issues, and could trigger economic ripple effects. In response, the U.S. is deploying a sterile insect technique — releasing millions of sterilized male flies to disrupt reproduction — with a massive new facility under construction in Texas. Meanwhile, political blame games are heating up as officials push for faster action, including targeted baits, while the focus remains on containment through monitoring, reporting, and quarantine.

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