The United States has turned to an unlikely pair of allies in its battle against the destructive screwworm: sniffer dogs and sterile flies. The parasite, which feeds on living flesh, has re-emerged in Florida, threatening livestock and wildlife. But as America scrambles, Britain stands as a global leader in biosecurity, a position hard-won through decades of vigilance and investment.
Screwworm infestations are a nightmare for farmers. Flies lay eggs in open wounds, and the hatching larvae burrow deeper, causing agony and often death. In the 1950s, the US pioneered the sterile insect technique, flooding areas with irradiated male flies to break the breeding cycle. That success nearly eradicated the pest. But climate change and imported animals have brought it back.
Now, USDA teams use trained dogs to sniff out infested animals. It is a desperate measure for a wealthy country that let its guard slip. In contrast, Britain never relaxed. Strict import controls, rapid response teams, and public awareness have kept screwworm at bay. Our vets inspect every incoming animal. Our farmers report every suspected case. It is a system that works.
Yet this biosecurity comes at a cost. Budget cuts threaten the very agencies that protect our borders. The Animal and Plant Health Agency, which runs the surveillance, has seen real-terms funding falls. Meanwhile, the Department for Environment, Food and Rural Affairs is stretched thin. A single outbreak could devastate our livestock sector, which supports tens of thousands of jobs.
The US crisis is a warning. Climate change is shifting pest ranges. Trade routes bring new threats. Britain cannot afford complacency. The dogs and flies deployed in Florida are a stopgap. We need permanent safeguards: more vets, better surveillance, and support for farmers to spot trouble early.
The government touts its biosecurity as world-leading, and it is. But leadership requires constant investment. As the US fights its flesh-eating flies, Britain must ensure it never has to. The cost of prevention is high. The cost of an outbreak is unthinkable.
