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Evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in India

OBJECTIVES: Self-collected vaginal swabs can facilitate diagnosis of vaginal discharge (VD) in resource-limited settings, provided reliability of the method is established. The aim of this study was to evaluate the concordance between self-collected and physician-collected vaginal swabs for aetiolog...

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Autores principales: Khan, Zarine, Bhargava, Aradhana, Mittal, Pratima, Bharti, Rekha, Puri, Poonam, Khunger, Niti, Bala, Manju
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BMJ Publishing Group 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6719764/
https://www.ncbi.nlm.nih.gov/pubmed/31462459
http://dx.doi.org/10.1136/bmjopen-2018-025013
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author Khan, Zarine
Bhargava, Aradhana
Mittal, Pratima
Bharti, Rekha
Puri, Poonam
Khunger, Niti
Bala, Manju
author_facet Khan, Zarine
Bhargava, Aradhana
Mittal, Pratima
Bharti, Rekha
Puri, Poonam
Khunger, Niti
Bala, Manju
author_sort Khan, Zarine
collection PubMed
description OBJECTIVES: Self-collected vaginal swabs can facilitate diagnosis of vaginal discharge (VD) in resource-limited settings, provided reliability of the method is established. The aim of this study was to evaluate the concordance between self-collected and physician-collected vaginal swabs for aetiological diagnosis of VD and to determine the prevalence of bacterial vaginosis (BV), vulvovaginal candidiasis (VVC) and trichomonas vaginitis (TV). METHODS: A total of 550 females (median age: 32 years; range: 18–45 years) attending two sexually transmitted infection/reproductive tract infection (STI/RTI) clinics with VD from January 2015 to May 2016 were included in the study after obtaining written informed consent. Swabs were self-collected by patients after instructions and subsequently by a physician under speculum examination. Samples were processed for standard bedside tests, Gram staining, wet mount and culture (gold standard) according to the national guidelines. Concordance between the two methods was determined by the Cohen’s kappa value. RESULTS: BV, VVC and TV were diagnosed in 79 (14.4%), 144 (26.2%) and 3 (0.5%) patients, respectively. VVC coexisted with BV in 58 (10.5%) patients. There was no coinfection of TV with BV or VVC. Candida albicans was isolated in 84 (58.3%) VVC cases. Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of self-collected swabs for diagnosing BV was 91.1%, 100%, 100% and 98.5%, respectively, while for the C. albicans VVC and TV, sensitivity, specificity, PPV and NPV all were 100% as compared with physician-collected swabs. Highly concordant results were obtained between two methods by the Kappa values of 0.95 (BV), 0.99 (VVC) and 1.0 (TV). CONCLUSION: The comparative performance of self-collected and physician-collected vaginal swabs establishes self-collection of samples for BV, VVC and TV as a viable alternative tool in the management of STIs/RTIs, especially in peripheral and resource-constrained settings. This would be effective in implementing the diagnostic approaches for STIs/RTIs in community-based surveillance studies at national or regional level and therefore strengthening the National STI/RTI Control Programme.
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spelling pubmed-67197642019-09-17 Evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in India Khan, Zarine Bhargava, Aradhana Mittal, Pratima Bharti, Rekha Puri, Poonam Khunger, Niti Bala, Manju BMJ Open Sexual Health OBJECTIVES: Self-collected vaginal swabs can facilitate diagnosis of vaginal discharge (VD) in resource-limited settings, provided reliability of the method is established. The aim of this study was to evaluate the concordance between self-collected and physician-collected vaginal swabs for aetiological diagnosis of VD and to determine the prevalence of bacterial vaginosis (BV), vulvovaginal candidiasis (VVC) and trichomonas vaginitis (TV). METHODS: A total of 550 females (median age: 32 years; range: 18–45 years) attending two sexually transmitted infection/reproductive tract infection (STI/RTI) clinics with VD from January 2015 to May 2016 were included in the study after obtaining written informed consent. Swabs were self-collected by patients after instructions and subsequently by a physician under speculum examination. Samples were processed for standard bedside tests, Gram staining, wet mount and culture (gold standard) according to the national guidelines. Concordance between the two methods was determined by the Cohen’s kappa value. RESULTS: BV, VVC and TV were diagnosed in 79 (14.4%), 144 (26.2%) and 3 (0.5%) patients, respectively. VVC coexisted with BV in 58 (10.5%) patients. There was no coinfection of TV with BV or VVC. Candida albicans was isolated in 84 (58.3%) VVC cases. Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of self-collected swabs for diagnosing BV was 91.1%, 100%, 100% and 98.5%, respectively, while for the C. albicans VVC and TV, sensitivity, specificity, PPV and NPV all were 100% as compared with physician-collected swabs. Highly concordant results were obtained between two methods by the Kappa values of 0.95 (BV), 0.99 (VVC) and 1.0 (TV). CONCLUSION: The comparative performance of self-collected and physician-collected vaginal swabs establishes self-collection of samples for BV, VVC and TV as a viable alternative tool in the management of STIs/RTIs, especially in peripheral and resource-constrained settings. This would be effective in implementing the diagnostic approaches for STIs/RTIs in community-based surveillance studies at national or regional level and therefore strengthening the National STI/RTI Control Programme. BMJ Publishing Group 2019-08-27 /pmc/articles/PMC6719764/ /pubmed/31462459 http://dx.doi.org/10.1136/bmjopen-2018-025013 Text en © Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.
spellingShingle Sexual Health
Khan, Zarine
Bhargava, Aradhana
Mittal, Pratima
Bharti, Rekha
Puri, Poonam
Khunger, Niti
Bala, Manju
Evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in India
title Evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in India
title_full Evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in India
title_fullStr Evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in India
title_full_unstemmed Evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in India
title_short Evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in India
title_sort evaluation of reliability of self-collected vaginal swabs over physician-collected samples for diagnosis of bacterial vaginosis, candidiasis and trichomoniasis, in a resource-limited setting: a cross-sectional study in india
topic Sexual Health
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6719764/
https://www.ncbi.nlm.nih.gov/pubmed/31462459
http://dx.doi.org/10.1136/bmjopen-2018-025013
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