A new threat is emerging on the radar of U.S. pork producers, as experts warn of the New World screwworm—a parasitic fly whose larvae feed on the living tissue of warm-blooded animals. Historically found in South America and the Caribbean, this pest has recently been detected as far north as Veracruz, Mexico, raising alarm over the potential for re-entry into the United States.
To address the growing concern, the Swine Health Information Center (SHIC) and the American Association of Swine Veterinarians (AASV) are hosting a webinar this Friday at 10:00 a.m. CST titled:
“Emerging Risk of New World Screwworm and Efforts to Prevent Re-introduction into the U.S.”
A Hidden but Serious Risk to Swine Operations
While screwworm infestations are more commonly associated with cattle, swine are not immune, especially when wounds or surgical sites are present. Dr. Megan Niederwerder, Executive Director of SHIC, emphasizes that producers and veterinarians must remain vigilant for unusual wound healing or signs of infestation.
“It’s really important to be looking for maggots in wounds or other body openings,” Dr. Niederwerder explains. “This includes mucus membranes, the umbilicus of newborn piglets, tail docking sites, castration wounds, or any surgical incisions.”
Key signs of concern include:
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Bloody discharge or foul odor from wounds
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Wounds that fail to heal normally or worsen over time
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Animals showing pain, lethargy, irritability, or reduced food intake
Any suspected cases should be immediately reported to state or federal animal health officials, as early detection is critical to preventing a broader outbreak.
Staying Ahead of the Threat
The upcoming webinar will explore how to recognize early warning signs, prevention strategies, and response plans for U.S. pork operations. A recording of the webinar will also be made available at swinehealth.org for those unable to attend live.
With foreign animal disease threats on the rise, this initiative reflects SHIC’s continued commitment to early detection and producer education—key pillars in safeguarding U.S. herd health.
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Swine Web Takeaway:
The New World screwworm may be a lesser-known threat, but its potential impact on swine health is serious. As its geographic range expands, education and prevention are more vital than ever. Pork producers are encouraged to register for Friday’s SHIC/AASV webinar and take steps to improve wound management protocols on their operations.
