First screwworm infestation discovered in the US in 60 years in Texas ranch

A screwworm — a parasite that feeds on the skin of humans and animals — has been discovered in a calf on a Texas ranch near the US-Mexico border, marking the first case in the US in 60 years. The parasite causes severe injuries and can be fatal to both animals and humans. The discovery raises concerns about cross-border disease transmission.

In Texas, near the US-Mexico border, a screwworm infestation has been detected in cattle for the first time in 60 years. The parasitic infection was identified in a young calf displaying characteristic symptoms.

The screwworm is a parasitic fly larva that burrows into the tissue of living warm-blooded animals and humans, feeding on living flesh. Infection can cause severe wounds and, without treatment, can be fatal.

The US officially eradicated this parasite in the 1960s through a large-scale control programme, making this new case particularly concerning. According to experts, the infestation is likely linked to cross-border movement from Mexico, where screwworm infestation remains prevalent.

US agricultural officials have launched an investigation and implemented quarantine measures to prevent further spread of the parasite. Farmers have been warned and urged to monitor their livestock closely and report any suspicious cases immediately to veterinarians.