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  • Title: Genetic diversity among Mycobacterium avium complex AccuProbe-positive isolates.
    Author: Soini H, Eerola E, Viljanen MK.
    Journal: J Clin Microbiol; 1996 Jan; 34(1):55-7. PubMed ID: 8748272.
    Abstract:
    The partial 32-kDa-protein gene sequences of 22 Mycobacterium avium complex (MAC) clinical isolates that were positive by the AccuProbe MAC probe only (not by the M. avium or M. intracellulare probe) were determined. The obtained nucleotide sequences were compared with the published sequences for M. tuberculosis, M. avium, and M. intracellulare by a sequence analysis program. There was a wide range of genetic diversity among the strains studied. Most of them (16 of 22) had sequences similar but not identical to those of M. avium and M. intracellulare. These strains were considered to be true MAC strains. Five strains had sequences in the category of the novel MAIX sequence, which was very different from the sequences of other mycobacteria analyzed thus far. In addition to these strains, one isolate had a sequence that differed greatly from the reference sequences. These results support previous findings showing that the MAC probably contains several additional species. Our results also suggest that the MAC AccuProbe may react with strains that do not belong to the MAC.
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