Concerns Rise Over Screwworm Fly’s Return

The New World screwworm has made an unwanted return to the United States, 60 years after it was officially eradicated. This flesh-eating fly, harmful to livestock and other animals, was recently detected in a 3-week-old calf in Texas, federal officials reported.

The fly’s larvae feed on the tissue of animals, posing a significant threat to livestock, wildlife, and pets. If infections are left untreated, they can be fatal. Years of aggressive eradication efforts had successfully removed the pest from North and Central America. However, the fly has remained prevalent in South America and has been moving northward toward the U.S. border in recent years.

Screwworm infestations historically had severe impacts on cattle, and their resurgence could increase challenges for cattle farmers. The return might also contribute to rising beef prices. Caleb Hubbard, an entomologist at New Mexico State University, warned about the fly’s destructive potential for the livestock industry.

The pest isn’t limited to livestock; it can also affect wildlife, pets, and, though rare, humans. In response, federal and state authorities are working to contain the outbreak in Texas. Agriculture Secretary Brooke Rollins emphasized the importance of working together and adhering to guidelines, adding that such cooperation should prevent the pest from establishing itself again in the country.