Testing for syphilis in pregnancy aims to detect women who have the infection so that they can be treated and transmission to babies prevented.
Syphilis is a sexually acquired infection caused by Treponema pallidum. In pregnancy, it can result in spontaneous miscarriage or stillbirth or cause congenital syphilis infection. Syphilis in pregnancy can be safely treated with antibiotics, which can prevent these complications.
36.1.1 Syphilis in Australia
- Rates of diagnosis of syphilis: Between 2007 and 2014, notification rates for infectious syphilis among women were below 2.0 per 100,000. Rates rose to 2.5 per 100,000 in 2015 and 3.6 per 100,000 in 2016 .[ ] Rates among women in 2016 were highest in the 15–19 year (11.5 per 100,000), 20–24 year (9.5 per 100,000) and 25–29 year (9.9 per 100,000) age groups. The rate of notification for infectious syphilis among Aboriginal and Torres Strait Islander women was 39 times that among non-Indigenous women (57.1 vs 1.5 per 100,000) .
- Geographical distribution: In 2016, infectious syphilis notification rates were highest in remote and very remote areas of residence (49.4 per 100 000) . Increases in notification rates occurred in all regions of residence between 2012 and 2017, with the sharpest increase in regional areas (209%) followed by remote areas (176%). Rates of notification among Aboriginal and Torres Strait Islander people were highest in the Northern Territory (229.6 per 100,000) and Queensland (99.3 per 100,000) , corresponding with regions in which there has been an outbreak of infectious syphilis.
- Congenital syphilis: Australia is a country of low prevalence for congenital syphilis. However, coinciding with peaks in infectious syphilis notifications, there have been peaks in cases of congenital syphilis, with four cases in 2015, declining from a high of eleven in 2006 . Three of the four cases were in Aboriginal and Torres Strait Islander babies.
- Refugee background: An Australian cohort study found higher prevalence among women from humanitarian source countries than among women from non-humanitarian source countries in Africa (1.2-7.5% vs 0–0.3%) and Africa and Asia (2.5% vs 0.4 p < 0.001) .
- Risk factors: Syphilis in Australia continues to be an infection primarily of men having male-to-male sex in urban settings, and of young heterosexual Aboriginal and Torres Strait Islander people in remote communities .
36.1.2 Risks associated with syphilis in pregnancy
Maternal syphilis infection results in congenital infection in at least two-thirds of cases. Congenital infection can occur at any stage of maternal disease, including during incubation , as early as 9–10 weeks of pregnancy and at any subsequent time during pregnancy .
Congenital syphilis is a serious condition that, if not fatal at a young age, can cause permanent impairment, debilitation and disfigurement. Pancreatitis and inflammation of the gastrointestinal tract are common .
36.2 Syphilis testing
36.2.1 Effectiveness of universal testing
Universal syphilis testing programs have been shown to significantly increase the detection of pregnant women who have syphilis compared with selective testing of women considered to be a high-risk IUSTI) and the United Kingdom national guidelines on the management of syphilis as it decreases the proportion of babies with clinical symptoms of syphilis infection.. Based on convincing observational evidence, universal testing of pregnant women is recommended by the United States Preventive Services Task Force , the World Health Organization , the International Union against Sexually Transmitted Infections (
Universal testing for syphilis has been shown to be cost-effectiveeven in areas of low prevalence.
Routinely offer and recommend syphilis testing at the first antenatal visit as treating syphilis benefits both mother and baby.
Approved by NHMRC in December 2011; expires December 2016 UNDER REVIEW
36.2.2 Type of test
There are two main classifications of serological tests for syphilis:
- non-treponemal tests, which detect non-specific treponemal antibodies and include the Venereal Diseases Research Laboratory (VDRL) and rapid plasma reagin (RPR) tests
- treponemal tests, which detect specific treponemal antibodies and include EIAs, T. pallidum haemagglutination assay (TPHA) and the fluorescent treponemal antibody-absorbed test (FTA-abs).
The NICE guidelines reviewed the evidence on syphilis testing in pregnancy and found:
- treponemal IgG EIA tests have high sensitivity (98%) and specificity (99%) at all stages of syphilis (except early primary syphilis), are useful for detecting syphilis antibodies in patients who are infected with HIV, and are comparable to the VDRL and TPHA combination in terms of sensitivity and specificity
- non-treponemal tests may result in false negatives, particularly in very early or late syphilis, in patients with reinfection or those who are HIV positive, and have poor positive predictive value when used alone in low prevalence populations
- neither type of test will detect syphilis in its incubation stage .
The initial test is usually a test for antibodies of treponema (eg enzyme immunoassay), which identifies women with current untreated or incompletely treated infection or previous history of treated syphilis. If the test is positive, a non-treponemal test will be performed by the laboratory to confirm diagnosis and enable a quantitative value of disease activity to guide treatment.
36.2.3 Testing in rural and remote areas
On-site syphilis tests are being developed to allow results to be given and overcome the barrier to treating pregnant women who have to return to the clinic for tests results and treatments. The tests evaluated appear to have adequate sensitivity and specificity to be useful in remote areas or where equipment and lab equipment is not availableand, in one study, reduced delays in treatment .
36.3 Follow-up for women who test positive to syphilis
Not all women who test positive will have syphilis, as these serological tests cannot distinguish between different treponematoses (eg syphilis, yaws, pinta and bejel). Therefore, positive results should be interpreted with caution. Following confirmation of a reactive specimen, a second specimen should be tested to verify the results and ensure correct identification of the woman.
Because syphilis is a rare condition in most parts of Australia and a positive result does not necessarily mean that a woman has syphilis, expert advice regarding the care of women who test positive and their partners should be sought. Assessment/testing for other sexually transmitted infections in women with positive serology is advisable.
Approved by NHMRC in December 2011; expires December 2016 UNDER REVIEW
36.4 Outbreak management
In January 2011, an increase of infectious syphilis notifications among young Aboriginal and Torres Strait Islander people was identified in the North-West region of Queensland. Subsequent increases in notifications were reported in the Northern Territory and Western Australia in July 2013 and June 2014 respectively, following sustained periods of low notification rates.
The disease control interventions that have been implemented include: opportunistic and community testing, particularly among young sexually active people aged less than 35 years; immediate treatment of people who are symptomatic (eg genital ulceration), have tested positive for syphilis or are sexual contacts of cases; and antenatal testing for syphilis. Public health alerts, health protection and education and campaigns, and active follow-up of cases are also being conducted.
Over the course of the recent outbreak (January 2011 to December 2015), the rate of congenital syphilis (including both confirmed and probable cases) in the Aboriginal and Torres Strait Islander populations for all of Queensland, the Northern Territory and Western Australia averaged 23.0 cases per 100,000 live births, which was lower than that recorded in the 5 years prior to the outbreak (2006 to 2010) at 38.2 cases per 100,000 live births.
Point-of-care rapid syphilis testing has been used with good effect in recent outbreaks in remote Australia, both in the context of community-wide testing and to increase opportunistic testing within primary care services Guidance on responding to a notifiable disease event is included in Section 36.6..
36.4.1 Notification of congenital syphilis
One study found that 95% of babies in the Northern Territory meeting Communicable Disease Network Australia (CDNA) criteria for probable congenital syphilis were not notified between 2009 and 2014 and that improved education regarding CDNA criteria for notification of congenital syphilis is necessary for clinicians and public health staff.
36.5 Practice summary: syphilis
Early in antenatal care.
- Aboriginal and Torres Strait Islander health worker
- multicultural health worker.
- Discuss the reasons for syphilis testing
Explain that it is important to find out whether a woman has syphilis because of the effects that infection can have on the pregnancy and the baby.
- Document and follow-up
Note the results of syphilis testing in the woman’s record, including whether the syphilis is newly diagnosed or was previously treated. Have a follow-up system in place so that infected women receive timely treatment or referral.
- Take a holistic approach
If a woman is found to be infected with syphilis, important considerations include counselling, contact tracing, partner testing, testing for other sexually transmitted infections and follow-up.
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- 25 An expanded infectious syphilis national case definition was implemented in July 2015 in all jurisdictions except for New South Wales, where it was implemented in July 2016. The new case definition includes a new subcategory of ‘probable’ infectious syphilis to capture infectious syphilis cases in people without a prior testing history, particularly young people aged 15–19 years. The probable infectious syphilis cases are included in the number of infectious syphilis notifications in 2015 and 2016.