# Screwworm Outbreak Spreads Across U.S. Animal Population
U.S. agricultural and health officials have escalated their response to a growing screwworm outbreak that has now infected livestock and pets across multiple states. The parasitic fly, which burrows into living flesh and feeds on tissue, represents a serious threat to animal health and agriculture.
Screwworms (Cochliomyia hominivorax) lay eggs in open wounds or body openings of warm-blooded animals. The larvae tunnel into tissue, creating painful lesions that can turn septic without treatment. Confirmed cases have appeared in cattle, goats, and dogs, prompting federal agencies to expand surveillance and control measures.
The U.S. Department of Agriculture and state veterinary officials have intensified monitoring efforts at borders and livestock facilities. They're implementing increased inspections and coordinating with neighboring countries where screwworm populations persist naturally. The goal centers on preventing the pest from establishing permanent populations in the U.S., where it was eradicated decades ago through intensive control programs.
Livestock owners face immediate practical steps: inspect animals regularly for wounds or unusual behavior, keep wounds clean and treated, and report suspected cases to state veterinarians immediately. Early identification proves critical for treatment success. Veterinarians can prescribe ivermectin and other antiparasitic medications when diagnosed promptly.
The outbreak carries economic implications for farmers and ranchers who manage treatment costs and potential herd losses. Animal welfare concerns remain paramount, as infected animals experience significant pain and distress.
Officials haven't confirmed human cases in this outbreak, though screwworms can infect people through open wounds. History shows this remains rare when proper wound care occurs.
The federal response includes deploying sterile screwworm flies as a biological control method, a proven technique used successfully in previous eradication efforts