Elanco Mobilizes Emergency Treatments as New World Screwworm Threatens U.S. Livestock

Event summary

  • First confirmed case of New World screwworm in U.S. livestock detected in Texas on June 4, 2026.
  • Elanco receives FDA emergency authorizations for Credelio products to treat screwworm infestations in pets.
  • Negasunt Powder and Tanidil approved for livestock under EPA Section 18 emergency exemption.
  • Elanco's portfolio includes treatments for dogs, cats, and various livestock species.
  • Products distributed through USDA's National Veterinary Stockpile with strict safety protocols.

The big picture

The re-emergence of New World screwworm in the U.S. after 50 years presents a significant threat to animal agriculture. Elanco's rapid mobilization of treatments underscores the critical role of animal health companies in responding to biological threats. The strategic importance of emergency authorizations highlights the regulatory flexibility needed during agricultural crises. The situation could reshape preventive healthcare practices in livestock and pet management.

What we're watching

Geographic Spread
How quickly the screwworm infestation spreads beyond Texas and whether Elanco can scale production of emergency treatments.
Regulatory Oversight
Whether FDA and EPA maintain emergency authorizations and what long-term approval process might look like.
Market Impact
The potential financial impact on livestock producers and pet owners as they adopt preventive measures.