Zoetis has earned FDA conditional approval for Dectomax-CA1, the first injectable designed for New World Screwworm control in cattle. The product prevents infestations caused by Cochliomyia hominivorax larvae and offers up to 21 days of reinfestation protection. It can be used in beef cattle, bulls, calves, pregnant cows, and female dairy cattle under 20 months of age.
This approval comes at a critical moment. New World Screwworm (NWS) has reappeared in northern Mexico, less than 70 miles from the U.S. border. USDA estimates show a major outbreak could cost Texas cattle producers $732 million annually and lead to $1.8 billion in economic losses.
Economic and Strategic Benefits
Zoetis plans to release Dectomax-CA1 in 2026 in 250-ml and 500-ml bottles. The formulation is based on doramectin, already used in Zoetis’ Dectomax, but re-labelled specifically for screwworm prevention.
For cattle producers, the benefits are clear. The injectable supports herd health, reduces parasite-related risks, and safeguards economic stability. In addition, it strengthens preventive strategies that protect livestock against the growing screwworm threat.
Prevention and Early Detection
Experts stress that early detection and immediate reporting of suspected infestations are essential. NWS larvae appear pale with spiny bands and burrow into wounds within three days, causing serious tissue damage. Therefore, producers should work closely with veterinarians and integrate Dectomax-CA1 into herd health plans.
As a result, combining veterinary monitoring with Zoetis’ innovation offers a proactive approach to cattle protection. This not only reduces losses but also ensures stronger resilience against emerging parasite pressures.
