New World Screwworm
New World screwworm is a harmful fly whose larvae feed on the living tissue of warm-blooded animals by infesting open wounds, potentially causing serious injury or death if untreated. Cases have been reported in the United States, and the Arizona Livestock Incident Response Team (ALIRT) is leading efforts to detect the pest and protect Arizona's livestock.
Livestock Inspection Guide for New World screwworm
Detailed instructions on how to check your animals for screwworm and report suspected cases.
Free sampling kits
If you suspect a case, contact your local Extension office for a free sampling kit.
Track reported case locations
The latest information from the USDA and partnering organization on the location and status of confirmed cases.
Screwworm outreach and education toolkit
Help raise awareness and protect Arizona's livestock and wildlife. This toolkit includes ready-to-use social media posts and educational posters about what screwworm is and why it's important to report cases.
What to know about New World screwworm
Extension experts outline how to protect your livestock from screwworm by checking wounds often, treating wounds quickly and reporting suspected cases using sampling kits.
How Extension is supporting ranchers
The Arizona Livestock Incident Response Team (ALIRT) is providing early detection kits and on the ground support to ranchers across Arizona.