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*Includes obligate pathogens, opportunistic pathogens and saprophytes
*Includes obligate pathogens, opportunistic pathogens and saprophytes
*Cause chronic, progressive, granulomatous infections
*Cause tuberculosis, Johne's disease and feline leprosy
*Environmental species found in soil, vegetation and water
===Characteristics===
===Characteristics===
*Cell walls contain mycolic acid
*Cell walls contain mycolic acid
*Require egg-based media for growth
*Require egg-based media for growth
*Slow-growing colonies
*Resistant to disinfectants and environmental conditions; susceptible to pasteurisation
===Identification===
*Identified by Ziehl-Neelson staining
*Differentiated by culture, biochemical tests, chromatography and molecular techniques
*Pathogenic species require at least three weeks for growth on egg-based media
===Clinical infections===
===Bovine tuberculosis===
*Epidemiology
**World-wide disease caused by ''M. bovis''
**Aerosol transmission between cattle kept in close contact
**Transmission to calves via ingestion od contaminated milk
**Wildlife reservoirs include badgers and possibly deer in the Europe
*Pathogenesis and pathogenicity===
**