NMPF Statement on the Return of New World Screwworm

Jun 05, 2026

The return of New World screwworm to the United States decades after its initial eradication is a disappointing milestone, but it’s also one for which dairy producers have been preparing for more than a year, in collaboration with USDA and across agriculture. It’s important to remember that this development has no effect on food safety, and that measures to combat both the screwworm and its spread are in place and time-tested.

We appreciate the U.S. Department of Agriculture’s proactive efforts to prepare for this moment, and we stand ready to work with the department to address any ongoing challenges.

Now that USDA has confirmed that screwworm is here, dairy farmers and all livestock producers pledge close collaboration with USDA, state and local officials, and producer organizations to mitigate any harmful effects and educate farmers on how to protect their herds.

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Video: ASF Control Lessons - Dr. Mary-Louise Penrith

In this episode of The Swine it Podcast Show Canada, Dr. Mary-Louise Penrith, Extraordinary Professor at the University of Pretoria, shares what decades of work have revealed about ASF control. She explains why vaccine development remains difficult, how human activity and food waste drive disease spread, why resistant pig populations are an important research area, and how strict biosecurity with the right disinfectants can help to stop transmission. Listen now on all major platforms!

"It's really a very human-driven disease because people move pigs, decide how they're raised, how they're sold, and good biosecurity can do anything to ensure control."

Meet the guest: Dr. Mary-Louise Penrith / mary-louise-penrith-2b12bb42 is an Extraordinary Professor in the Department of Veterinary Tropical Diseases at the University of Pretoria, South Africa. A veterinarian and internationally recognized researcher, she has dedicated decades to African swine fever epidemiology, control, and pig health, supporting FAO and WOAH initiatives while advancing research and education. Listen to Dr. Mary-Louise Penrith on the Swine Health Blackbelt Podcast, available on all major platforms.