Tuberculosis is a rare disease of cats, but is slightly more common in dogs. M. tuberculosis and M. bovis infections are generally contracted from humans although cattle and wild mammals might be an alternative source of infection in some areas. M. avium is a saprophyte found in soil and water, and only an opportunist pathogen of animals and man, while the main source of M. microti is probably voles: M. avium and M. microti infections are extremely rare.

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