Possession of the macrophage-induced gene by isolates of the Mycobacterium avium complex is not associated with significant clinical disease

Journal of Medical Microbiology
Jong Hyun YoonSue Shin

Abstract

The Mycobacterium avium complex (MAC) is the most frequently isolated species among non-tuberculous mycobacteria (NTM) clinical isolates. Physicians pay attention to the differential diagnosis of the disease caused by MAC from tuberculosis because of their similar clinical presentations. Expression of the macrophage-induced gene (mig) is one of the virulence phenotypes in MAC, but it has not been determined whether the presence of the mig gene itself has any relationship with clinical disease or whether it is merely a marker for MAC. To uncover the significance of the mig gene among MAC clinical isolates, positive cultures from respiratory specimens from patients in a tertiary referral centre were identified by sequencing the 16S rRNA gene. The mig gene was also evaluated using PCR and sequence analysis. The medical records from the patients were reviewed retrospectively. The diagnostic criteria from the American Thoracic Association were adopted for the diagnosis of NTM lung disease. A total of 45 MAC clinical isolates were identified over a period of 1 year. Following 16S rRNA sequencing, all of the 23 M. avium isolates were categorized as sequevar I. Among the 22 Mycobacterium intracellulare isolates, 18 strains were identif...Continue Reading

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Citations

Oct 15, 2009·Future Microbiology·Marcel A Behr, Joseph O Falkinham

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