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potential risks the procedure carries for pregnant mares (such as amniocentesis). This case report represents an uncommon presentation for


C. pseudotuberculosis infection in a pregnant mare. Although rare, C. pseudotuberculosis should be considered a differential for guttural pouch empyema or retropharyngeal lymph node abscessation. As recent reports have confirmed cases outside of traditionally endemic areas, veterinarians should consider C. pseudotuberculosis as a differential for external abscesses, guttural pouch infection or insidious signs associated with internal abscesses in horses from areas of the country outside the western and south-western USA.


Authors’ declaration of interests There were no conflicts of interest.


Authorship


P. DeLoache, D. Whelchel, R. Beetz, A Eichelberger, and N. Pusterla contributed to the preparation of the manuscript. P. DeLoache, D. Whelchel, R. Beetz, J. Carter and N. Pusterla contributed to the case management. All authors gave final approval of the manuscript.


Manufacturers' addresses


1Merck Animal Health, Madison, New Jersey, USA. 2IDEXX Laboratories Inc., Westbrook, Massachusetts, USA. 3Zoetis, Floram Park, New Jersey, USA. 4Bluegrass Animal Products, Inc., Lexington, Kentucky, USA. 5Intervet/Merck Animal Health, Madison, New Jersey, USA. 6California Animal Health and Food Safety Laboratory System, UC


Davis, Davis, California, USA. 7Butler Schein, Dublin, Ohio, USA. 8Cameron Pharmacy, St Matthews, South Carolina, USA. 9AHDC, Cornell University, Ithaca, New York, USA. 10Henry Schein, Dublin, Ohio, USA.


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Corynebacterium


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