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Journal of Clinical Microbiology, February 2000, p. 508-512, Vol. 38, No. 2
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Species Identification of Mycobacterium avium Complex Isolates by a Variety of Molecular Techniques

Marjorie L. Beggs,1,* Rossina Stevanova,2 and Kathleen D. Eisenach1,3

Departments of Pathology,1 Anatomy,2 and Microbiology and Immunology,3 University of Arkansas for Medical Sciences, and J. L. McClellan Memorial Veterans Hospital, Little Rock, Arkansas

Received 29 June 1999/Returned for modification 7 September 1999/Accepted 11 November 1999

Organisms in the Mycobacterium avium complex (MAC; M. avium, M. intracellulare, and "nonspecific or X" MAC) are emerging pathogens among individual organisms of which significant genetic variability is displayed. The objective of the present study was to evaluate various molecular methods for the rapid and definitive identification of MAC species. Isolates were obtained from both human immunodeficiency virus (HIV)-positive patients and HIV-negative patients with and without known predisposing conditions. The isolates were initially hybridized with nucleic acid probes complementary to the rRNA of the respective mycobacterial species (AccuProbe Culture Confirmation kits for M. avium, M. intracellulare, and MAC species; Gen-Probe). Isolates were also examined by PCR and in some cases by Southern blot hybridization for the insertion element IS1245. Two other techniques included a PCR assay that amplifies the mig gene, a putative virulence factor for MAC, and hsp65 gene amplification and sequencing. This study led to the following observations. Eighty-five percent of the isolates from HIV-positive patients were M. avium and 86% of the isolates from HIV-negative patients were M. intracellulare. Fifteen of the M. avium isolates did not contain IS1245 and 7% of the M. intracellulare isolates were found to carry IS1245. All of the M. avium strains were mig positive, and all of the M. intracellulare strains were mig negative.

* Corresponding author. Mailing address: John L. McClellan Memorial Veterans Hospital, Medical Research Department, Slot 151, 4300 W. 7th St., Room GB 126, Little Rock, AR 72205. Phone: (501) 257-4826. Fax: (501) 664-6748. E-mail: BeggsMarjorieL{at}exchange.uams.edu.

Journal of Clinical Microbiology, February 2000, p. 508-512, Vol. 38, No. 2
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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