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Journal of Clinical Microbiology, April 2006, p. 1413-1418, Vol. 44, No. 4
0095-1137/06/$08.00+0     doi:10.1128/JCM.44.4.1413-1418.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Use of PCR and Reverse Line Blot Hybridization Assay for Rapid Simultaneous Detection and Serovar Identification of Chlamydia trachomatis

Likuan Xiong,1,2 Fanrong Kong,1 Hua Zhou,2 and Gwendolyn L. Gilbert1*

Centre for Infectious Diseases and Microbiology, Institute of Clinical Pathology and Medical Research, Westmead, NSW, Australia,1 Institute of Molecular Biology, Centre for Prevention and Control of Sexually Transmitted Disease, Shenzhen Chronic Disease Hospital, Shenzhen, Guangdong Province, People's Republic of China 5180202

Received 26 August 2005/ Returned for modification 12 October 2005/ Accepted 27 January 2006

The aim of this study was to develop and evaluate multiplex and nested PCR-reverse line blot (RLB) hybridization assays for detection and serovar identification of Chlamydia trachomatis. Two sets of primers targeting the VD2 region of the omp1 gene and one set targeting the cryptic plasmid were designed for use in multiplex (both targets) and nested PCR (omp1 only). For the RLB assay, labeled omp1 amplicons were hybridized to a membrane containing probes specific for 15 C. trachomatis serovars. The assays were used to test 429 clinical specimens, which had been previously tested for C. trachomatis using the COBAS AMPLICOR system. Specimens were tested without knowledge of the COBAS AMPLICOR result. Of 205 specimens that were positive by COBAS AMPLICOR, 201 (98%) were positive by multiplex PCR-RLB and 188 (92%) were also positive by omp1 nested PCR-RLB. In addition, three of 224 COBAS AMPLICOR-negative specimens were positive by omp1 nested PCR-RLB. One hundred sixty-six of 191 (87%) specimens in which C. trachomatis serovars were identified contained only one serovar and 25 (13%) contained two or three serovars. Serovars D, E, and F were found in 31 (16%), 83 (43%), and 51 (27%) specimens, respectively. Serovar E (41%) was the most commonly identified single serovar. Serovars J and K were found alone uncommonly (<2% each), but 18 of 25 (72%) specimens with multiple C. trachomatis serovars contained one or both (10 specimens) of these serovars. The nested (ompI) PCR-RLB is a specific and sensitive method for simultaneous detection and serovar identification of C. trachomatis, which can reliably identify mixed C. trachomatis serovars. It is suitable for use in epidemiological studies.

* Corresponding author. Mailing address: Centre for Infectious Diseases and Microbiology (CIDM), Institute of Clinical Pathology and Medical Research (ICPMR), Westmead Hospital, Darcy Rd., Westmead, New South Wales 2145, Australia. Phone: (612) 9845-6255. Fax: (612) 9893-8659. E-mail: lyng{at}icpmr.wsahs.nsw.gov.au.

Journal of Clinical Microbiology, April 2006, p. 1413-1418, Vol. 44, No. 4
0095-1137/06/$08.00+0     doi:10.1128/JCM.44.4.1413-1418.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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