Leptospirosis behaves differently in maintenance versus incidental hosts. Maintenance hosts are often asymptomatic carriers of Leptospira organisms, whereas incidental hosts often exhibit severe clinical signs. An incidental host is most likely to acquire leptospirosis from which of the following?

Bite or scratch from a maintenance host
Contact with infected urine
Ingestion of infected feces
Inhalation of respiratory secretions

Tuberculosis in Horses

By

Charles O. Thoen

, DVM, PhD, Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University

Last full review/revision Aug 2014 | Content last modified Oct 2014

Horses are relatively resistant to tuberculosis caused by Mycobacterium tuberculosis; however, they are susceptible to M bovis. When tuberculosis does develop, tuberculous, noncalcified lesions are often found in the liver, mesenteric lymph nodes, lungs, and other sites. Tuberculin test results are rather erratic.

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