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Characterization of a Mycobacterium intracellulare Variant Strain by Molecular Techniques

ABSTRACT This paper describes a Mycobacterium intracellularevariant strain causing an unusual infection. Several isolates obtained from an immunocompromised patient were identified as members of theMycobacterium avium complex (MAC) by the commercial AccuProbe system and biochemical standard identification. Further molecular approaches were undertaken for a more accurate characterization of the bacteria. Up to seven different genomic sequences were analyzed, ranging from conserved mycobacterial genes such as 16S ribosomal DNA to MAC-specific genes such asmig (macrophage-induced gene). The results obtained identify the isolates as a variant of M. intracellulare, an example of the internal variability described for members of the MAC, particularly within that species. The application of other molecular approaches is recommended for more accurate identification of bacteria described as MAC members.