The U.S. Department of Agriculture detected a case of New World flesh-eating screwworm in a calf in South Texas on Wednesday [1].
This discovery is significant because the parasite has been moving northward through Central America. If confirmed, this instance represents the first detected breach of the U.S.-Mexico border by these flies [4].
Health officials said that parasitic larvae were found in the umbilical area of a three-week-old calf [2] in Zavala County [3]. The USDA announced the detection on June 3 [1].
"A case of flesh‑eating New World screwworm has been detected in South Texas," a USDA spokesperson said [1].
The parasite poses a substantial threat to food production and animal health. While the larvae primarily target livestock and pets, they can infect humans in rare cases [2]. The flies are known for their ravenous nature, consuming the living tissue of their hosts.
Agricultural officials are monitoring the situation to prevent a wider outbreak. The detection in Zavala County [3] signals a critical point of entry that could jeopardize the U.S. livestock industry if the parasite spreads beyond the initial site.
“Parasitic larvae were found in the umbilical area of a three-week-old calf in Zavala County.”
The arrival of the New World screwworm in Texas indicates a failure of previous containment barriers along the southern border. Because the parasite feeds on living tissue, it can cause rapid deterioration of livestock, leading to massive economic losses in the cattle industry and requiring aggressive eradication efforts to prevent a national agricultural crisis.
