Top 5 things you need to know about this invasive screwworm crisis as it surges
- A devastating flesh-eating parasite, the New World screwworm, is spreading at alarming rates in livestock and pets across Central America, triggering emergency quarantines and threatening to reach the U.S. border. The larvae burrow into open wounds, causing fatal infections if left untreated, making this a major agricultural and public health emergency.
- The current outbreak is the worst in decades, fueled by climate change and relaxed border surveillance. In April alone, officials reported a 45% spike in confirmed screwworm cases, with entire herds in Panama and Costa Rica being culled to contain the spread.
- Screwworm is notoriously hard to control because adult flies can travel over 100 miles in a single week. This mobility has resulted in the pest hopping from cattle pastures into suburban areas, where it has started infecting dogs, goats, and even wild birds, creating a multispecies nightmare.
- The U.S. Department of Agriculture has mobilized a "sterile insect technique" program, dropping millions of sterilized male screwworm flies from planes to disrupt breeding. However, experts warn that funding cuts have reduced the program's capacity by 30%, leaving a dangerous gap in defense against the invasion.
- Travelers and pet owners need to watch for warning signs: animals with foul-smelling, oozing wounds or visible maggots. If you suspect screwworm, do not treat at home—this is a notifiable disease, and immediate veterinarian reporting is required to prevent a national outbreak.