First discovered in California in 1915, cases of Corynebacterium pseudotuberculosis are showing up in areas where it was once unknown. The external subcutaneous abscessation that frequently occurs in the pectoral region or ventral abdomen resembles a pigeon’s breast which is the only association pigeons have with the disease. Also known as dryland distemper or false strangles, the disease can cause internal abscessation and ulcerative lymphangitis of the limbs.
To limit the spread of disease, biosecurity practices should be employed, focusing on reducing environmental contamination and preventing transmission via insects and fomites.
Source: The Horse, February 15, 2026. Link. Traditionally, C. pseudotuberculosis has been associated with dry, arid climates in the Western United States, with outbreaks typically occurring in the late summer or fall. However, outbreaks across the U.S. and Canada have been observed in recent years, including in non-endemic areas such as Kentucky, Louisiana, Michigan, North Carolina, South Carolina, Utah, Colorado, Oregon, Florida and Idaho.
Image: Link.
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