New research from the University of Saskatchewan has identified the primary bacterial agent responsible for porcine ear-tip necrosis, a painful and costly condition affecting pigs in every major pork-producing region.
Ear-tip necrosis, first described in the 1950s, causes the ear tissue to turn black and deteriorate. For decades, theories pointed to mycotoxins, porcine circovirus, and other contributing factors—but no definitive cause had been proven.
A research team led by Dr. Matheus (Mateus) Costa, associate professor at the Western College of Veterinary Medicine and adjunct professor at Utrecht University, has now confirmed that Fusobacterium necrophorum is the direct cause of the disease.
Blind Trial Confirms Infectious Nature of the Disease
Supported by funding from the Saskatchewan Ministry of Agriculture, researchers conducted a blind clinical trial in which pigs were artificially inoculated with Fusobacterium necrophorum and compared to uninoculated sentinel pigs.
Their findings were clear:
“We confirmed that ear necrosis is indeed an infectious disease and that Fusobacterium necrophorum alone is all we need to replicate the disease,” said Dr. Costa.
“This fundamentally changes the way we understand pig ear necrosis and breaks the dogma of about 50 years.”
Industry Impact: New Pathways for Treatment, Prevention, and Research
The confirmation of a single causal agent has major implications for both field veterinarians and researchers:
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More accurate diagnostics
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Targeted treatment strategies
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Evidence-based control and mitigation approaches
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Opportunity for vaccine and therapeutic development
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Improved management models for future research trials
For producers, the findings provide clarity after decades of uncertainty.
“Now we know who we’re dealing with,” Dr. Costa said. “Before, it was usually just a shot in the dark.”
Peer-Reviewed Publication Available
The full research is published in the peer-reviewed, open-access journal PLOS One.
It can be found by searching: “reproduction of ear necrosis”.
