CTNPT 036: Novel Assay for Syphilis

About the Study

This pilot study is looking at the acceptability and performance of a new test that could allow for earlier detection of syphilis in men who have sex with men (MSM) who do not yet have symptoms. This is important, as earlier diagnosis in people who may have the infection but do not know it would allow for earlier treatment, potentially preventing the development of troublesome symptoms and complications; also, it could prevent passing the infection to others. This study aims to illuminate some of the missing information about syphilis testing, potentially leading to better and faster ways of diagnosing the infection.

Background

There has been a recent spike in syphilis cases reported in Canada and many other countries. These record-high syphilis rates disproportionately affect MSM and about two thirds of syphilis cases in Canada are in MSM living with HIV, and rates of reinfection are also high. Syphilis infection can cause serious complications as well as increase risk of both passing and acquiring HIV.

The current screening method for syphilis detects antibodies, the immune systems response to an infection. However, it can take up to 6 weeks for the immune system to respond with enough antibody to be detected by the test. This means that people may appear syphilis-negative and be unknowingly passing the infection along during that time period. Detection of syphilis in people living with HIV may take even longer.

In response to the current testing tool and to the resurgence of syphilis as a public health concern, Dr. Troy Grennan is leading a study to evaluate the use of polymerase chain reaction (PCR), a technique which can detect the presence of syphilis DNA using a swab of an affected area, or in the blood. As a pilot study, this investigation is primarily concerned with how participants perceive the test ” whether they find it acceptable and whether they would be willing to do it again.