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Genetic diversity of Mycobacterium avium isolates recovered from clinical samples and from the environment: molecular characterization for diagnostic purposes

Investigación publicada en Journal of Clinical Microbiology

1 de abril de 2008

Isolation of Mycobacterium avium complex (MAC) organisms from clinical samples may occur in patients without clinical disease, making the interpretation of results difficult. The clinical relevance of MAC isolates from different types of clinical samples (n = 47) from 39 patients in different sections of a hospital was assessed by comparison with environmental isolates (n = 17) from the hospital. Various methods for identification and typing (commercial probes, phenotypic characteristics, PCR for detection of IS1245 and IS901, sequencing of the hsp65 gene, and pulsed-field gel electrophoresis) were evaluated. The same strain was found in all the environmental isolates, 21 out of 23 (91.3%) of the isolates cultured from urine samples, and 5 out of 19 (26.3%) isolates from respiratory specimens. This strain did not cause disease in the patients. Testing best characterized the strain as M. avium subsp. hominissuis, with the unusual feature that 81.4% of these isolates lacked the IS1245 element. Contamination of certain clinical samples with an environmental strain was the most likely event; therefore, characterization of the environmental mycobacteria present in health care facilities should be performed to discard false-positive isolations in nonsterile samples, mainly urine samples. Molecular techniques applied in this study demonstrated their usefulness for this purpose




Alvarez J., Garcia IG., Aranaz A., Bezos J., Romero B., de Juan L., Mateos A., Gomez-Mampaso E. y Dominguez L..




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Genetic diversity of Mycobacterium avium isolates recovered from clinical samples and from the environment: molecular characterization for diagnostic purposes

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Genetic diversity of Mycobacterium avium isolates recovered from clinical samples and from the environment: molecular characterization for diagnostic purposes


Participantes:

Universidad ComplutenseDepartamento de Sanidad Animal. Facultad de Veterinaria. Universidad Complutense (UCM).

Universidad ComplutenseServicio de Micobacterias (MYC). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM).

Gobierno de Castilla-La ManchaServicio de Urología. Hospital Virgen de la Salud. Gobierno de Castilla-La Mancha (JCCM).

Comunidad de MadridServicio de Microbiología. Hospital Universitario Ramón y Cajal. Salud Madrid. Comunidad de Madrid.







Journal of Clinical Microbiology
FACTOR YEAR Q
3.945 2008

NLMID: 7505564

PMID: 18272714

ISSN: 0095-1137



TÍTULO: Genetic diversity of Mycobacterium avium isolates recovered from clinical samples and from the environment: molecular characterization for diagnostic purposes


REVISTA: J. Clin. Microbiol.


NUMERACIÓN: 46(4):1246-51


AÑO: 2008


EDITORIAL: American Society for Microbiology


AUTORES: Alvarez J., Garcia IG., Aranaz A., Bezos J., Romero B., de Juan L., Mateos A., Gomez-Mampaso E. and Dominguez L..


PARTICIPANTES VISAVET


First
Julio Álvarez Sánchez
4th
Javier Bezos Garrido
5th
Beatriz Romero Martínez
6th
Lucía de Juan Ferré
Last
Lucas Domínguez Rodríguez

DOI: https://doi.org/10.1128/JCM.01621-07


CITA ESTA PUBLICACIÓN:

Alvarez J., Garcia IG., Aranaz A., Bezos J., Romero B., de Juan L., Mateos A., Gomez-Mampaso E. y Dominguez L. Genetic diversity of Mycobacterium avium isolates recovered from clinical samples and from the environment: molecular characterization for diagnostic purposes. Journal of Clinical Microbiology. 46(4):1246-51. 2008. (A). ISSN: 0095-1137. DOI: 10.1128/JCM.01621-07


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