Flesh-eating New World screwworm detected Texas cow

Screwworm returns to the U.S.—after decades away

The U.S. Department of Agriculture has confirmed a case of the New World screwworm in a Texas cow. It is the first instance in about 60 years that the parasite with flesh-eating larvae has been detected in the United States.

Screwworms are dangerous because their larvae can damage the skin and flesh of cattle and other animals, often creating serious wounds and increasing the risk of infection and death if not treated. The fact that the parasite is reappearing after being absent for decades raises concerns about how far it may spread and how quickly control measures can be deployed.

Why this detection matters

• It signals that the livestock-protection status of the U.S. has been challenged again.
• A returning parasite can threaten cattle health and raise costs related to veterinary care and surveillance.
• The detection also increases the urgency of outbreak-response procedures that can prevent establishment.

What’s known—and what’s not

The report confirms the case and location, but no further details are provided in the story about additional animals, how the infestation is being traced, or how officials plan to contain it.

The main implication is that animal-health agencies will likely increase monitoring and containment efforts to keep the parasite from re-establishing itself.

For ranchers and veterinarians, the key point is heightened awareness: early detection is usually the difference between rapid control and a wider outbreak.