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Sputum acid-fast bacillus (AFB) tests were negative.
On the basis of phenotypic and genotypic data, we consider the unknown acid-fast bacillus to represent a novel species of the genus Mycobacterium, for which the name M.
Guidelines proposed by Centers for Disease Control and Prevention (CDC) include a 24-hour TAT from receipt of the specimen to reporting results for the acid-fast bacillus (AFB) smear, 14 days for detection of growth, 21 days for identification of Mycobacterium tuberculosis, and 28 days for susceptibility testing.