Deadly Flesh-Eating Screwworm Detected In Texas Sparks Major Food Supply Alarm

US health and agriculture officials are racing to contain a dangerous outbreak after a flesh-eating New World screwworm was detected in a calf in South Texas - the first confirmed case in US livestock in decades. The discovery has triggered serious concerns over livestock safety, economic losses, and potential disruption to America’s food production system. The United States Department of Agriculture confirmed that laboratory testing identified the parasite in a three-week-old calf in La Pryor, Texas. In response, the agency has launched emergency containment efforts, including quarantines, movement restrictions, surveillance, and the release of sterile flies to stop the pest from spreading.Also read: Feeling Jittery After Coffee? Expert Explains

The Hidden Anxiety Link

What is the new world screwworm?

The New World screwworm is a parasitic fly whose larvae feed on the living tissue of warm-blooded animals. Unlike ordinary maggots that consume dead tissue, screwworm larvae burrow into open wounds and begin eating healthy flesh. Female flies lay eggs in cuts, wounds, or body openings of animals. Once the eggs hatch, the larvae aggressively feed on tissue, causing painful and potentially fatal infections. The parasite mainly threatens cattle and livestock, wildlife, and pets, but rarely humans. However, experts warn that severe infestations can destroy tissue, trigger dangerous bacterial infections, damage organs, and even kill infected animals if untreated.

Why are officials concerned?

Although officials say the screwworm does not pose a food safety risk to consumers, it could seriously damage food production and livestock industries. The US eradicated the parasite decades ago using a massive sterile-fly release program, strict surveillance, and international control efforts. However, recent outbreaks in Central and South America have raised fears that the parasite could return to North America. Agriculture experts warn that widespread infestations could reduce cattle production, increase livestock deaths, raise beef prices, and cost the economy billions of dollars. According to the Federal Reserve Bank of Dallas, a major outbreak similar to one seen in 1972 could cost the US Southwest alone more than $3 billion.

How are authorities fighting the outbreak?

The USDA has created a 20-kilometer infected zone in Texas while deploying veterinary teams and surveillance measures. One of the primary control strategies involves releasing millions of sterile male flies into affected regions. When wild female flies mate with sterile males, they cannot produce offspring, gradually collapsing the parasite population. The US government is also expanding border surveillance, using detector dogs at the US-Mexico border, sending teams to Mexico and Panama, and building a $750 million sterile-fly production facility in Texas. Officials say the new facility will eventually produce hundreds of millions of sterile flies every week.

Can humans get screwworm infections?

Human infections are rare but possible, especially among people exposed to livestock or open outdoor environments in affected regions. According to the Centers for Disease Control and Prevention, risk factors include:

• Open wounds or sores
• Insect bites
• Spending time around livestock
• Sleeping outdoors in affected areas

Symptoms may include painful wounds, visible larvae, swelling, foul-smelling discharge, and tissue damage. The current risk to humans in the US remains extremely low.

Why does this outbreak matter?

The detection of New World screwworm in Texas highlights how animal health threats can quickly become major economic and public health concerns. Rapid detection, quarantines, sterile-fly programs, and international cooperation will be critical to preventing the parasite from becoming permanently re-established in the US livestock system. For now, officials are urging ranchers, veterinarians, and pet owners to monitor animals closely for unusual wounds, larvae, or signs of infection as containment efforts continue.