Onsite Rapid Antenatal Syphilis Screening With an Immunochromatographic Strip Improves Case Detection and Treatment in Rural South African Clinics


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Abstract

Objectives:Congenital syphilis is a significant cause of adverse pregnancy outcomes. In South Africa, rural clinics perform antenatal screening offsite, but unreliable transport and poor client follow up impede effective treatment. We compared 3 syphilis screening strategies at rural clinics: onsite rapid plasma reagin (RPR), onsite treponemal immunochromatographic strip (ICS) test, and the standard practice offsite RPR with Treponema pallidum hemagglutination assay (RPR/TPHA).Methods:Eight rural clinics performed the onsite RPR and ICS tests and provided immediate treatment. Results were compared with RPR/TPHA at a reference laboratory. Chart reviews at 8 standard practice clinics established diagnosis and treatment rates for offsite RPR/TPHA.Findings:Seventy-nine (6.3%) of 1,250 women screened onsite had active syphilis according to the reference laboratory. The onsite ICS resulted in the highest percentage of pregnant women correctly diagnosed and treated for syphilis (89.4% ICS, 63.9% onsite RPR, 60.8% offsite RPR/TPHA). The onsite RPR had low sensitivity (71.4% for high-titer syphilis). The offsite approach suffered from poor client return rates. One percent of women screened with the ICS may have received penicillin unnecessarily. There were no adverse treatment outcomes.Conclusions:The onsite ICS test can reduce syphilis-related adverse outcomes of pregnancy through accurate diagnosis and immediate treatment of pregnant women with syphilis.

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