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Rhodococcus Equi

Rhodococcus equi is a Gram-positive facultative intracellular pathogen that is a common cause of bronchopneumonia in foals between 3 weeks and 5 months of age. R. equi can also cause various extrapulmonary infections. Although R. equi can be cultured from the environment of virtually all horse farms, the clinical disease in foals is endemic at some farms and only sporadic at others. Infections are extremely rare in adult horses.