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As many as 20% of adult horses in certain areas of the United States are infected with Borrelia burgdorferi, the spirochete (a type of spiral-shaped bacterium) that causes Lyme disease, according to Cornell University researcher and clinician Tom Divers, DVM, Dipl. ACVIM. Horses are infected through Ixodes tick bites. Divers said that many horses in endemic areas are, or have been, infected, which is evidenced by the fact that 75% of horses in the Northeast and Mid-Atlantic states already have antibodies against the organism.

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Above used with permission from

ACVIM 2006: Lyme Disease Update 
by: Kim A. Sprayberry, DVM, Dipl. ACVIM 
September 2006 Article # 7644