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Journal of Clinical Microbiology, 03 1995, 668-674, Vol 33, No. 3
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Use of a multiplex PCR to detect and identify Mycobacterium avium and M. intracellulare in blood culture fluids of AIDS patients

JK Kulski, C Khinsoe, T Pryce and K Christiansen
Department of Microbiology, Royal Perth Hospital, Australia.

The presence of mycobacteria in blood culture fluids (BACTEC) of AIDS patients with positive growth indices (GIs, > 20 U) was investigated by using a multiplex PCR to detect and identify members of the genus Mycobacterium, M. avium, M. intracellulare, and M. tuberculosis. Three different methods of extracting mycobacterial DNA from blood culture fluid were compared for use with the multiplex PCR. Mycobacterial cells were pelleted from a small aliquot of blood culture fluid by centrifugation, and the DNA was extracted from cells by heat lysis or a sodium iodide-isopropanol or a phenol-chloroform method. DNAs of different sizes were amplified from a region of the MPB70 gene of M. tuberculosis (372 bp) and from a region of the 16S rRNA gene of members of the genus Mycobacterium (1,030 bp), M. intracellulare (850 bp), or M. avium (180 bp) as a multiplex PCR in a single tube. The amplified DNA products were detected by agarose gel electrophoresis and ethidium bromide staining in all 41 (100%) positive cultures after sodium iodide- isopropanol extraction, in 18 (44%) after heat lysis, and in 5 (12%) after phenol-chloroform extraction. Of the 41 positive cultures, 38 were identified as M. avium and 2 were identified as M. intracellulare by both routine methods and multiplex PCR. The remaining mycobacterium was identified as M. intracellulare by routine methods and as M. avium by the multiplex PCR. Another six blood cultures that were negative for the presence of acid-fast bacilli after Ziehl-Neelson staining were also negative by PCR.(ABSTRACT TRUNCATED AT 250 WORDS)

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