The United States Department of Agriculture (USDA
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The US Has a Plan to Combat Screwworm. It Involves a Lot More Flies
A flesh-eating parasitic fly that poses a major threat to livestock has returned to the United States after 60 years. This week, the US Department of Agriculture confirmed the presence of New World screwworm in a calf in southern Texas. Eliminated in the US in 1966 and as far south as Panama by 2006, its recent reemergence in Mexico made it likely that the screwworm would eventually enter the country again, with modeling showing that it could arrive as soon as summer 2025.
US reports second case of dangerous livestock pest
US reports second case of dangerous livestock pest Andrew Zinin Lead Editor The US Department of Agriculture (USDA) said Friday it has detected a second case of a dangerous livestock pest whose flesh-eating larvae can kill cattle. The new incidence of so-called New World screwworm (NWS) was detected in a calf in south Texas about 5.5 miles (10 km) from the first one, which was reported Thursday, the department said on X. The outbreak has triggered a race to keep the pest from spreading.
What to know about the New World screwworm fly and its reappearance in the US
What to know about the New World screwworm fly and its reappearance in the US Fri 5 Jun 2026 at 1:01pm The New World screwworm fly is threatening the $US113 billion United States cattle industry for the first time in more than a half century, with an infestation from its flesh-eating larvae confirmed in south Texas. The infestation was discovered in a single 3-week-old calf in La Pryor, Texas, about 161 kilometres south-west of San Antonio and 80 kilometres from the US-Mexico border. Federal...
First US screwworm case in 60 years: Should America be worried?
First US screwworm case in 60 years: Should America be worried? The US Department of Agriculture says New World screwworm has been detected in a Texas calf. The New World screwworm, a flesh‑eating parasite which infects cattle and other warm‑blooded animals, has been found in a calf in Texas, the US Department of Agriculture announced on Wednesday.
The Screwworm Is Messing With America’s Beef
This is an edition of The Atlantic Daily, a newsletter that guides you through the biggest stories of the day, helps you discover new ideas, and recommends the best in culture. The first thing you should know about the New World screwworm is that it isn’t actually a worm; it’s a fly. At the larva stage, it twists into the flesh of its host, devouring it from within.
Nightmare parasite that eats living flesh detected in Texas after disappearing for decades
Nightmare parasite that eats living flesh detected in Texas after disappearing for decades Agriculture Secretary Brooke Rollins said the case was in a 3-week-old calf in LaPryor, Texas, about 50 miles from the Mexico border - Bookmark - CommentsGo to comments A highly destructive parasite, the New World screwworm fly, has been confirmed in south Texas, marking its first appearance in the state since 1966 and only the third time in the U.S. in decades. The U.S. Department of Agriculture...
Dangerous livestock pest case confirmed in Texas
Dangerous livestock pest case confirmed in Texas Andrew Zinin Lead Editor The United States said on Thursday that the New World screwworm (NWS) fly, a dangerous livestock pest whose flesh-eating larvae can kill cattle, has been detected in a calf in south Texas. "We have a confirmed positive detection of New World screwworm in a three-week-old calf," US Agriculture Secretary Brooke Rollins said in a briefing. She said "immediate action" to contain and eradicate the parasite that has raised...
Flesh-eating screwworm is confirmed in the U.S., officials say
A New World screwworm has been detected in a bovine located in Zavala County, Texas, the U.S. Department of Agriculture's Animal and Plant Health Inspection Service said. A three-week-old calf was affected, with larvae were identified in its umbilical area, according to a press statement on Wednesday, adding that there are no further detections to date. "USDA invested heavily in the tools needed to eliminate NWS ever since cases started increasing in Central America and Mexico.
Not to Alarm Anyone, but Flesh-Eating Screwworms Have Entered the US
A case of New World screwworm has been confirmed in South Texas, the US Department of Agriculture announced Wednesday night. It marks the first detected breach of the US-Mexico border by the ravenous flesh-eating flies, which have been making their way up through Central America for the past several years. In a social media post on Wednesday afternoon, the USDA revealed that a sample from Texas had been sent to the National Veterinary Services Laboratories (NVSL) in Ames, Iowa, for...
The U.S. fought the flesh-eating screwworm for decades. Now it must begin again.
The United States spent more than half a century and hundreds of millions of dollars driving the flesh-eating New World screwworm as far from its borders as possible. The species can eat the tissue of any warm-blooded animal, but it’s a particular threat to livestock and is often fatal for cattle. Some environmentally minded bioethicists have openly debated whether it would be moral to deliberately drive the screwworm into extinction.