Last data update: May 06, 2024. (Total: 46732 publications since 2009)
Records 1-4 (of 4 Records) |
Query Trace: Kikkert S[original query] |
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A comparison of the analytical level of agreement of nine treponemal assays for syphilis and possible implications for screening algorithms
Castro A , Jost H , Cox D , Fakile Y , Kikkert S , Tun Y , Zaidi A , Park M . BMJ Open 2013 3 (9) e003347 OBJECTIVE: The serological diagnosis of syphilis requires the detection of two distinct antibodies, the non-treponemal and trepomenal. Center for Disease Control and Prevention (CDC) recommends screening first with a non-treponemal test such as (Rapid Plasma Reagin/Venereal Disease Research Laboratory), and then confirming those results with one of the several treponemal tests (Fluorescent Treponemal Antibody-Absorption (FTA-ABS), Enzyme Immunoassay, chemiluminescence, treponema pallidum particle agglutination (TP-PA) or Point of Care). Owing to the high volume of samples processed by some laboratories using automated systems, the screening with treponemal assays and confirming with non-treponemal tests is becoming the established norm. The purpose of this study was to evaluate eight treponemal assays using TP-PA as the predicate assay. METHODS: 290 stored serum samples were tested qualitatively according to the manufacturer's directions. RESULTS: Concordance with specimens tested as reactive or non-reactive using TP-PA was: FTA-ABS 94.5-100%, Trep-Sure 100-98.9%, BioELISA 100-98.9%, INNO-LIA 99.1-99.4%, BIOLINE 100-98.9%, CAPTIA IgG 100-97.2%, Trep-ID 100-100% and LIAISON 100-99.4%. In order to properly evaluate the performance of these assays, the analytical sensitivity was determined by endpoint titration of serial dilutions of the reactive serum samples in normal sera. The median endpoint titre varied from 1:4 for FTA-ABS to 1:512 for Trep-Sure. CONCLUSIONS: The performance of the treponemal serological assays was comparable while using medium and high-titre sera. However, the varying performance on specimen dilutions suggests that there may be differences in sensitivity with low-titre sera that are more prevalent in primary and late syphilis cases. |
Evaluation of a digital flocculation reader for the rapid plasma reagin test for the serological diagnosis of syphilis
Castro AR , Binks DD , Raymer DL , Kikkert SE , Jost HA , Park MM , Card BD , Cox DL . Sex Transm Dis 2012 39 (3) 223-5 We described the ASiManager-AT digital flocculation reader to demonstrate concordance between visual and digital readings of the rapid plasma reagin test for detection of antibodies in the serum of patients with syphilis. A qualitative and quantitative rapid plasma reagin was performed on each serum samples giving a concordance of 98.6% and 99.7%, respectively, for reactives and 100% for nonreactives. |
Novel point-of-care test for simultaneous detection of nontreponemal and treponemal antibodies in patients with syphilis
Castro AR , Esfandiari J , Kumar S , Ashton M , Kikkert SE , Park MM , Ballard RC . J Clin Microbiol 2010 48 (12) 4615-9 We describe a point-of-care immunochromatographic test for the simultaneous detection of both nontreponemal and treponemal antibodies in the sera of patients with syphilis that acts as both a screening and a confirmatory test. A total of 1,601 banked serum samples were examined by the dual test, and the results were compared to those obtained using a quantitative rapid plasma reagin (RPR) test and the Treponema pallidum passive particle agglutination (TP-PA) assay. Compared to the RPR test, the reactive concordance of the dual test nontreponemal line was 98.4% when the RPR titers of sera were ≥1:2 and the nonreactive concordance was 98.6%. Compared to the TP-PA assay, the reactive and nonreactive concordances of the treponemal line were 96.5% and 95.5%, respectively. These results indicate that the dual test could be used for the serological diagnosis of syphilis in primary health care clinics or resource-poor settings and therefore improve rates of treatment where patients may fail to return for their laboratory results. |
An immunofiltration device for the simultaneous detection of non-treponemal and treponemal antibodies in patients with syphilis
Castro AR , Mody HC , Parab SY , Patel MT , Kikkert SE , Park MM , Ballard RC . Sex Transm Infect 2010 86 (7) 532-6 OBJECTIVE: The development of a rapid immunofiltration (flow-through) test for the simultaneous detection of non-treponemal and treponemal antibodies in the serum of patients with syphilis. METHODS: The assay is rapid, inexpensive, and requires limited expertise in interpreting the results. The test is based on the principle of immunofiltration, with two antigens and control material spotted on the membrane of a through-flow device. A positive test is characterised by the appearance of three red/magenta spots within 2-10 min. RESULTS: A total of 376 banked serum samples obtained from the Georgia Public Health Laboratory was examined by the flow-through test, the rapid plasma reagin (RPR) test and the Treponema pallidum passive particle agglutination assay (TPPA). The sensitivity and specificity of the non-treponemal spot were 96.5% and 97.7%, respectively, when compared with the RPR test, and the sensitivity and specificity of the treponemal test spot were 97.3% and 99.1% when compared with the TPPA test. In addition, the test yielded equivalent results to those obtained in comparator tests when 104 sera from cases of syphilis of known stage, 49 sera from diseases other than syphilis and 23 sera known to exhibit biological false-positive reactions were tested in parallel. CONCLUSIONS: These results indicate that the dual treponemal and non-treponemal assay could be used as a screen and confirmatory test for the serological diagnosis of syphilis in remote or resource-poor settings where there is a need to provide counselling and treatment at the initial consultation. |
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