Autor: |
Badak, F. Zuhre, Goksel, Servet, Sertoz, Ruchan, Guzelant, Asuman, Kizirgil, Ahmet, Bilgic, Altinay |
Zdroj: |
Journal of Clinical Microbiology; December 1999, Vol. 37 Issue: 12 p4189-4191, 3p |
Abstrakt: |
ABSTRACTWe evaluated cord formation in MB/BacT broth as a rapid method for presumptive identification of the Mycobacterium tuberculosiscomplex. Kinyoun acid-fast-stained smears from 370 positive MB/BacT bottles were examined for the presence of serpentine cording. The smears were examined independently by two observers. Observer 1 (the supervisor of the mycobacteriology laboratory) examined all of the smears while observer 2 (a clinical microbiologist not familiar with acid-fast bacillus [AFB] microscopy) examined 148 randomly chosen smears that were read by observer 1 without knowledge of which smear was which. The sensitivity, specificity, and positive and negative predictive values of cording for the presumptive identification of M. tuberculosisread by observer 1 were 88.2, 97.4, 99.2, and 69.7%, respectively. These values were reported at 90.6, 52.3, 82.8, and 69.7%, respectively, by observer 2. Our laboratory prevalence of M. tuberculosisamong positive cultures was 78% during the time this study was conducted. At the time of positive signal of the MB/BacT bottles, the broth of the bottles had sufficient cell mass to allow for observation of the presence or absence of serpentine cording. The presence of cords in MB/BacT broth is a reliable criterion for rapid, predictive identification of theM. tuberculosiscomplex for laboratories with a high proportion of the M. tuberculosiscomplex when the smears are examined by a microbiologist who has experience with AFB staining. |
Databáze: |
Supplemental Index |
Externí odkaz: |
|