The USDA confirmed the first New World screwworm case in the U.S. in decades on Wednesday night, in a 3-week-old calf in South Texas's Zavala County.

The Department of Agriculture flagged a possible case of New World Screwworm or NWS in South Texas, sparking fears about the flesh-eating fly coming to the US.

The U.S. Department of Agriculture has confirmed that the New World screwworm fly has arrived in south Texas.