06/04/2026
The first detection of New World Screwworm (NWS) has occurred in Zavala County, Texas, on a 3-week-old calf in the umbilical area. This detection was confirmed yesterday by USDA-APHIS.
Want to learn more about the pest and the current response? Here are some links to some helpful links:
🔘Official APHIS announcement of NWS case: https://www.aphis.usda.gov/news/agency-announcements/usda-confirms-presence-new-world-screwworm-united-states
🔘Unified Government website for most accurate and up to date NWS information: screwworm.gov
🔘USDA New World Screwworm Playbook and Supplemental materials: www.aphis.usda.gov/sites/default/files/nws-response-playbook.pdf
🔘U.S. Food and Drug Administration (FDA) Animal Drugs for New World Screwworm: https://www.fda.gov/animal-veterinary/safety-health/new-world-screwworm-information-veterinarians
🔘USDA APHIS Pesticides for Control of New World Screwworm: www.aphis.usda.gov/sites/default/files/pesticides-for-nws.pdf
🔘NCBA resources including posters and handouts (will be updated in coming days): www.bqa.org/screwworm
🔘NCBA Cattlemen’s Webinar on “New World Screwworm - Regulations, Readiness & Response”: https://youtu.be/Xv6TfIoUEfM?si=iejH3ZmG9LUpCnL1