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The Return of a Eradicated ParasiteThe New World screwworm, a flesh-eating parasite which infects cattle and other warm-blooded animals, has been found in a calf in Texas, the US Department of Agriculture announced on Wednesday. This marks the first confirmed case in the United States since the parasite was declared eradicated in 1966, following decades of successful containment through biological barriers and sterile fly release programs.The screwworm is believed to have travelled from Central America to Mexico before being found in the calf in LaPryor, Texas, around 50km from the Mexican border. Experts suggest that a combination of factors, including possible disruptions to sterile-fly programs during the COVID-19 pandemic, increased movement of livestock and people, and favorable weather conditions, may have contributed to its re-emergence.Understanding the Screwworm ThreatA screwworm comes from the larvae of a screwworm fly (Cochliomyia hominivorax), and humans can indeed be infected. Female screwworm flies lay their eggs in scratches and wounds of warm-blooded animals, normally livestock or wild animals. The eggs hatch into hundreds of screwworm larvae which eat the living tissue of the infected animals.The flies are attracted to the smell of open wounds on the bodies of these animals, or sometimes even of humans. Newborn calves are particularly vulnerable because the post-partum navel has yet to scar. The larvae use their sharp mouths to burrow through the living flesh of their hosts for about a week before dropping to the ground to form a pupa.Screwworm can be devastating in cattle and wildlife, which can die from infection if untreated. As adult screwworm flies are capable of travelling many kilometers in search of hosts, infestations can spread quickly across wildlife populations, livestock herds and between humans.Economic Fallout for the Beef IndustryAn outbreak in the US could heavily impact the livestock industry and cause increased beef prices. The USDA predicts that could cost the Texas economy $1.8 billion in losses. Between mid-July and mid-August 2025, Mexico reported a 53 percent rise in the number of cases in animals, indicating the rapid spread of the parasite.Washington has halted cattle imports from Mexico for the past year, citing the insect's spread further into Mexico. The US typically imports more than one million Mexican cattle annually. The import suspension has already contributed to rising beef prices by tightening the supply of beef cattle, which dwindled after a drought forced ranchers on both sides of the border to reduce herds.Mexican cattle are usually fed and fattened on US farms for five to six months before slaughter, and a diminished slaughter rate can also raise beef prices. With US cattle herds already at a multi-decade low after severe drought, high feed costs have forced ranchers to shrink their herds.Regional Vulnerability and ResponseA quarantine zone spanning 20km (12.4 miles) has been established around the affected farm in Texas with no movement of any animals including pets. The infected calf is being treated and the larvae will be killed. The primary measures being implemented include vigilance, identification and isolation of cases, treatment and elimination of larvae, and controlling movement of animals.Dr Timothy Goldsmith, a veterinary medicine professor at the University of Minnesota, noted that homeless people can be especially vulnerable to infestation because they sleep outside and have less access to hygiene products and medical care. Last year, Mexico confirmed 41 human cases, primarily in the state of Chiapas.The parasite reappeared in Panama, Costa Rica, Nicaragua, Honduras, Guatemala, Belize and El Salvador before moving on to Mexico in 2023. While the precise reasons for its resurgence are unclear, experts point to climate change, increased global travel, and disruptions to agricultural monitoring programs as potential contributing factors.Future Outlook and Prevention MeasuresThe first confirmed case in the US during the latest outbreak represents a serious challenge for ranchers and could cause beef prices to rise further. After decades of eradication, most cattle ranchers no longer have the experience or tools to diagnose and treat screwworm, experts say.Infestations can be cured, but treatment is a time-consuming, pricey and labor-intensive process. A program of sterile male release is considered the best long-term method of controlling this fly, similar to the approach that successfully eradicated screwworm from the US in the 1960s.Authorities are likely to expand surveillance efforts along the US-Mexico border and potentially implement enhanced screening protocols for livestock entering the country. The incident highlights the ongoing challenges of biosecurity in an increasingly globalized world where pests and diseases can cross borders with ease.

The Plant-Based Paradox: Growing Alternatives vs. Meat Dominance Should I tuck into a juicy steak or stick a tofu patty in a bun and call it a burger? Twenty years ago, that question was largely seen as a moral dilemma influenced by grim conditions in factory farms and slaughterhouses. Back then, animal rights activists were the loudest campaigners arguing for people to abstain from meat. They had limited success because vegetarians and vegans made up less than 5% of the population in rich countries – and the best fake meats were bland replicas of real flesh. The word flexitarian had not yet made it into the dictionary. The debate has shifted sharply. The pollution from animal agriculture, which makes up 12-20% of planet-heating gas, is now part of public discourse around eating meat. A dramatic rise in rates of obesity and diseases linked to red meat have made health concerns part of individual decisions to eat less of it. Meanwhile, some plant-based alternatives have improved in texture and taste to the point where even meat lovers struggle to tell that they did not come from an animal. The Rise of Plant-Based Alternatives: Market Transformation In one sense, there is a powerful story of personal action to tell. The tiny market share of vegetarians in the early 2000s provided the demand that companies needed to invest in making substitutes taste better. These alternatives are now helping meat eaters reduce their intake – an easier sell than convincing people to give it up entirely. Add that to a growing awareness about the environmental harm that livestock cause, and a rise in public support for stopping climate breakdown, and you have the ingredients for what could be a major societal shift away from damaging levels of meat-eating. Early signs of the trend are visible in countries such as Germany, a sausage-hungry nation where about one in 10 people are vegan or vegetarian and a further 37% describe themselves as flexitarian. Plant-based alternatives have become so common that a third of the population buy them regularly, a government survey found in November, and discount supermarkets have launched their own brands. Village cafes in far-right regions seem perfectly happy to serve oat milk with coffee. The Meat Consumption Data: Global Trends and Statistics The broader picture, though, is still dominated by animals. Data in a new report from the UN's Food and Agriculture Organisation suggests the average person eats six times as much chicken and twice as much pork as their grandparents did, with global meat supply having risen fourfold in the last 60 years. Much of the growth has taken place in poor countries in which better access to meat has helped counter hunger and malnutrition. But consumption is projected to keep rising, albeit at a slower rate, even in rich countries, where climate scientists and doctors recommend cutting down. Livestock are expected to contribute the vast majority of the projected 7.6% rise in global agricultural emissions over the next decade, at a time when global emissions from other parts of the economy, such as electricity generation, are set to fall. Industry Resistance and Consumer Behavior Patterns It is too early to tell whether the backlash signals a reversal or stalling of efforts to shift diets toward plants. In the UK, YouGov data shows the proportion of people who are vegetarians and vegans peaked in 2021 at 10% and has since fallen to 7%, while survey data in many other European countries suggests little change or even continued growth. The meat industry, meanwhile, is working hard to safeguard its dominance. In March, EU politicians voted to ban meaty names such as steak and bacon for plant-based alternatives. In the US, the "Make America Healthy Again" campaign from the Trump administration has enthusiastically promoted eating more meat, including many cow products such as beef tallow, going against medical advice. The pro-meat movement may also benefit from the protein obsession that has gripped rich countries, as well as growing fears about the health risks of ultra-processed food. Doctors are sceptical of the former – protein deficiencies in rich countries are rare, unlike fibre deficiencies – while there is little evidence to say much about the health impacts of processed plant-based products compared with processed meat ones. Future Outlook: Environmental and Health Implications The calculation is made more concerning by the indirect health impacts of meat-heavy diets, which stretch well beyond the risks to the person following them. Knock-on effects from the livestock industry range from stronger extreme weather events caused by climate breakdown to antimicrobial resistance that spreads superbugs. On Wednesday, an FAO report found that the use of antibiotics on livestock would rise by nearly a third in the next 15 years without government intervention, with potentially disastrous consequences for protection from disease. Health research is full of contradictory studies, and some advocates of meat-free diets have made sweeping claims that are not supported by the science. But what is clear, at a population level, is that people in rich countries are eating more meat and fewer plants than doctors consider healthy. And at a global level, the environmental harm from animal agriculture is likely to rise at a time when the planet needs it to fall.