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Journal of Clinical Microbiology, October 1999, p. 3092-3096, Vol. 37, No. 10
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Determination of Chlamydia trachomatis
Prevalence in an Asymptomatic Screening Population: Performances of the
LCx and COBAS Amplicor Tests with Urine Specimens
Servaas A.
Morré,1
Irene G. M.
Van Valkengoed,2
Robert M.
Moes,1
A. Joan P.
Boeke,2
Chris J. L. M.
Meijer,1 and
Adriaan J. C.
Van den
Brule1,*
Department of Pathology, Section of Molecular
Pathology, University Hospital Vrije
Universiteit,1 and Institute for
Research in Extramural Medicine, Vrije
Universiteit,2 Amsterdam, The Netherlands
Received 7 May 1999/Returned for modification 8 June 1999/Accepted 29 June 1999
This study determined the performances of the LCx (Abbott) and
COBAS Amplicor (Roche) tests with urine specimens for the detection of
Chlamydia trachomatis in an asymptomatic screening
population. Randomly selected women and men (age range, 15 to 40 years)
registered in 20 general practices in Amsterdam, The Netherlands, were
invited to participate in this study. Urine specimens
(n = 2,906; 1,138 specimens from men and 1,717 specimens from women) were tested for C. trachomatis by the
COBAS Amplicor (Roche) and LCx (Abbott) tests. Samples which were
positive by only one assay were subjected to discrepant analyses by a
third assay (in-house plasmid PCR). By the LCx assay C. trachomatis DNA was detected in urine specimens from 46 of 1,717 women and 29 of 1,138 men, while the COBAS Amplicor detected C. trachomatis DNA in 52 and 35 specimens, respectively. When
comparing the LCx and COBAS Amplicor tests, 32 test results (20 for
women and 12 for men) were discrepant. After discrepant analyses the
following sensitivities, specificities, and positive predictive values
were found for the LCx and COBAS Amplicor tests: 78.6 versus 98.8%,
99.7 versus 99.9%, and 88.0 versus 95.4%, respectively. No prominent
differences were found between men and women with regard to the test
performances. After discrepant analyses the overall prevalences of
C. trachomatis in women and men were 3.0 and 2.8%,
respectively. For both women and men the prevalence in the younger age
groups was higher than that in the older age groups. In conclusion, the
COBAS Amplicor tests shows better diagnostic characteristics than the
LCx assay for the detection of C. trachomatis in urine
specimens from an asymptomatic screening population. In this
asymptomatic population the overall prevalence of C. trachomatis was 2.9%.
*
Corresponding author. Mailing address: Department of
Pathology, Section of Molecular Pathology, University Hospital Vrije Universiteit, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands. Phone: 31-20-4440503 or 31-20-4444023. Fax: 31-20-4442964. E-mail: vandenbrule{at}azvu.nl.
Journal of Clinical Microbiology, October 1999, p. 3092-3096, Vol. 37, No. 10
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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