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Year : 2012  |  Volume : 78  |  Issue : 4  |  Page : 443--447

A pilot study for diagnosis of genital Chlamydia trachomatis infections by polymerase chain reaction among symptomatic Indian women

1 Department of Microbiology, AIIMS, New Delhi, India
2 Regional STD Teaching, Training and Research Center, VMMC and SJH, New Delhi, India
3 Department of Ocular Microbiology, Dr. R.P. Centre for Ophthalmic Sciences, AIIMS, New Delhi, India
4 Department of Dermatology and Venereology, AIIMS, New Delhi, India
5 Department of Biostatistics, AIIMS, New Delhi, India

Correspondence Address:
Seema Sood
Department of Microbiology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0378-6323.98074

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Background: Chlamydia trachomatis is the most common bacterial etiology of sexually transmitted infection. Aim : A pilot study was designed using PCR for amplification and detection of a specific 517 bp sequence of the common endogenous plasmid of C. trachomatis from clinical swab specimens obtained from symptomatic female patients attending STD clinics of AIIMS and Regional STD Teaching, Training & Research Center, Safdarjang Hospital, New Delhi. Methods: 97 patients were recruited in the study, and endocervical swabs were collected following standard procedures. The samples were analyzed by PCR and direct fluorescence antibody (DFA) for detection of C. trachomatis, and the sensitivity, specificity, PPV and NPV of PCR were calculated taking DFA as gold standard. Results: Out of 97 samples tested, 9 were positive for C. trachomatis by PCR. 1 PCR positive patient was negative by DFA although a total of 11 patients were positive by DFA. The sensitivity, specificity, PPV and NPV of PCR with reference to DFA was 72.73%, 98.84%, 88.89% and 96.59%, respectively. This PCR had high specificity and NPV for detection of C.trachomatis. Conclusions : In light of the introduction of enhanced syndromic approach, which involves the use of laboratory techniques (wherever possible) to confirm clinical diagnosis, a diagnostic PCR with high specificity and NPV is particularly valuable for determination of etiological diagnosis and hence contribute to judicious use of antimicrobials in the community.


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