Althoughthere areother species causing TB, this is the only causative agent of human TB.It is fastidious, growing only on Lowenstein-Jensen and Middlebrook.It is slow growing (3-8 weeks or 12-24 hours doubling time).It is an acid-fast, non-motile, non-spore-forming, pleomorphic slender rod and an obligate aerobe.Although not considered to be gram-stainable, it is a weakly gram-positive rod. Gene probe technology now facilitates this distinction.
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