Performance of the rapid plasma reagin and the rapid syphilis screening tests in the diagnosis of syphilis in field conditions in rural Africa


West, B; Walraven, G; Morison, L; Brouwers, J; Bailey, R; (2002) Performance of the rapid plasma reagin and the rapid syphilis screening tests in the diagnosis of syphilis in field conditions in rural Africa. Sexually transmitted infections, 78 (4). pp. 282-5. ISSN 1368-4973 DOI: https://doi.org/10.1136/sti.78.4.282

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Abstract

OBJECTIVES: To assess the rapid plasma reagin (RPR) test performance in the field and to evaluate a new rapid syphilis test (RST) as a primary screen for syphilis. METHODS: 1325 women of reproductive age from rural communities in the Gambia were tested for syphilis seropositivity using a RPR 18 mm circle card and a RST strip. Within 1 week a repeat RPR and a TPHA test were carried out using standard techniques in the laboratory. RESULTS: Comparing field tests to a diagnosis of "active" syphilis defined as laboratory RPR and TPHA positive, the RPR test was 77.5% sensitive and 94.1% specific; the RST was 75.0% sensitive and 95.2% specific. The RST was easier to use and interpret than the RPR test especially where field conditions were difficult. In this setting with a low prevalence of syphilis in the community (3%), the chance of someone with a positive test being confirmed as having serologically active syphilis was less than 50% for both tests. CONCLUSIONS: The appropriateness of syphilis screening using RPR testing in antenatal clinics and health centres should be questioned if there is a low prevalence in the population, conditions for testing are poor, and resources limited. There is still an urgent need for an appropriate rapid syphilis test for field use.

Item Type: Article
Keywords: Prevalence, women, Adolescence, Adult, Comparative Study, Female, Gambia, epidemiology, Human, Mass Screening, methods, standards, Middle Age, Predictive Value of Tests, Prevalence, Reagent Strips, standards, Reagins, blood, Rural Health, Sensitivity and Specificity, Support, Non-U.S. Gov't, Syphilis, diagnosis, epidemiology, Syphilis Serodiagnosis, methods, standards
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Clinical Research
Faculty of Epidemiology and Population Health > Dept of Infectious Disease Epidemiology
Research Centre: Tropical Epidemiology Group
PubMed ID: 12181468
Web of Science ID: 177609900013
URI: http://researchonline.lshtm.ac.uk/id/eprint/17102

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