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Journal of Clinical Microbiology, Mar 1997, 676-678, Vol 35, No. 3
R Pasternack, P Vuorinen and A Miettinen
We evaluated the Gen-Probe Chlamydia trachomatis transcription-mediated
amplification (TMA) assay with urine specimens for the detection of C.
trachomatis infections in women. The novel test, based on the isothermal
amplification of chlamydial RNA, was compared with the Roche Amplicor PCR
with urine and cell culture with endocervical specimens. First-catch urine
and endocervical swab specimens were collected from a total of 561
patients, of whom 70 (12.3%) were confirmed to have chlamydial infection.
The diagnostic sensitivity and specificity of TMA with urine were 91.4 and
99.6%, respectively, and those of Amplicor PCR were 97.1 and 99.8%,
respectively. By repeated analysis of the specimens with discrepant
results, the sensitivity of TMA could be increased to 99%, indicating that
some methodological improvements in the assay are still to be expected. The
sensitivity of PCR could be increased to 100% by the elimination of DNA
polymerase inhibitors in a repeated analysis. The sensitivity and
specificity of cell culture with cervical specimens were 85.7 and 100%,
respectively. The results indicate that TMA with urine specimens from women
is a sensitive and specific assay for the detection of C. trachomatis,
providing a new noninvasive technique for the screening of chlamydial
infections in women.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Evaluation of the Gen-Probe Chlamydia trachomatis transcription- mediated amplification assay with urine specimens from women
Department of Clinical Microbiology, Tampere University Hospital, Finland.
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