The U.S. Department of Agriculture (USDA) has confirmed the detection of the flesh-eating New World screwworm in a calf in La Pryor, Texas. This marks the first time in decades that this parasitic fly has been found in U.S. livestock, raising concerns about its potential impact on food production and the economy.

Containment Efforts Underway

The USDA’s National Veterinary Services Laboratories in Ames, Iowa, tested a sample from a 3-week-old calf and confirmed the presence of the screwworm. In response, the USDA has activated personnel in Texas to contain and eradicate the parasite. Measures include establishing a 20-kilometer infested zone, implementing quarantines, movement controls, and surveillance in the area. Additionally, the USDA is expediting the release of sterile flies to limit the spread of the pest.

USDA Secretary Brooke Rollins emphasized the importance of cooperation in following animal treatment protocols and movement restriction guidance to prevent the establishment of the pest in the U.S. The New World screwworm was previously eradicated in the U.S. through similar efforts, but recent surges in South America have prompted increased vigilance.

Impact on Livestock and Wildlife

Screwworm infestations are not contagious between animals but occur when female flies lay eggs in fresh wounds of warm-blooded animals. The larvae feed on the host, potentially causing severe damage or death. The parasite also poses a threat to wildlife and pets, prompting veterinarians in Texas, Arizona, and New Mexico to monitor for new infections.

While human cases are rare, they can be fatal. The last U.S. human case was travel-related and occurred in Maryland last August. The current threat to human health is considered extremely low, and the screwworm does not pose a food safety risk. However, the economic impact on livestock could be significant, with potential costs reaching billions of dollars.

Preventive Measures and Future Plans

To combat the threat, the USDA has implemented new monitoring, testing, and quarantine protocols. It has also suspended the import of live animals through southern U.S. ports of entry and deployed dogs at the U.S.-Mexico border to detect screwworm. Additionally, the U.S. is investing $750 million in a Texas facility to produce sterile flies, set to open next year.

Experts like Max Scott, an entomologist at North Carolina State University, highlight the importance of sterile fly programs in controlling outbreaks. The USDA’s past success in eradicating the screwworm underscores the potential effectiveness of these measures.

Original reporting: KEYT (Ventura/Santa Barbara) — read the source article.