The New World screwworm, known for its flesh-eating larvae, has unexpectedly returned to the United States after 60 years of eradication efforts. These pests, which inflict serious harm on livestock, wildlife, and pets, have caused concerns among farmers and scientists.

Federal officials reported the latest infestation in a Texas calf, marking the screwworm’s first appearance since it was eliminated from North and Central America decades ago. The insects, although still prevalent in South America, have gradually moved northward toward the U.S. border.

Cattle have historically suffered significantly from screwworm infestations, which could now drive beef prices upward due to increased pressures on farmers. Caleb Hubbard, an entomologist at New Mexico State University, warns that these flies could severely impact the livestock industry.

The screwworm’s threat extends beyond livestock, affecting wildlife, pets, and occasionally, humans. To mitigate the infestation, federal and state officials are implementing containment measures in Texas. Agriculture Secretary Brooke Rollins emphasized the low risk to the public, stating that cooperation and adherence to treatment guidelines could prevent the pest’s establishment.