USPSTF Calls for Universal Syphilis Screening in Pregnancy

The United States Preventive Services Task Force (USPSTF) has issued an updated draft recommendation statement advising early screening for syphilis in all pregnant persons, whether symptomatic or in at-risk groups. Those with abnormal screening results should receive “timely, equitable, and evidence-based evaluation and treatment for syphilis,” it advises.

Reaffirming the task force’s 2018 statement, in which an evidence review found the benefits of screening substantially outweighed the harms, the current draft is based on no substantial new data. It is open for public input until December 23.

“Congenital syphilis infection is still an important health problem, and rates are not decreasing as they should,” said USPSTF panel member Carlos R. Jaén, MD, PhD, MS, Dr and Mrs James L. Holly Distinguished Chair in the Department of Family and Community Medicine at the Joe R. and Teresa Lozano Long School of Medicine at The University of Texas Health Science Center at San Antonio. “Cases are 10 times higher today than they were a decade ago, despite the harmful consequences of syphilis infection in mother and baby and despite it being a preventable and easily treated condition.”

The statement notes that untreated syphilis infection in mothers is associated with miscarriage, premature birth, low birth weight, stillbirth, and neonatal death. Syphilis infection is linked to significant abnormalities in infants such as deformed bones, anemia, enlarged liver and spleen, jaundice, meningitis, and brain and nerve problems resulting in permanent vision or hearing loss.

The USPSTF statement aligns with the recommendations of other healthcare organizations, including the American College of Obstetricians and Gynecologists (ACOG), which issued a clinical practice advisory on prenatal syphilis screening in April of this year.

This advisory recommends obstetric care providers screen all pregnant individuals serologically for syphilis at the first prenatal care visit, with universal rescreening during the third trimester and at birth rather than targeted risk-based testing.

The advisory notes that two in five infants with congenital syphilis were born to persons who received no prenatal care. It urges making any healthcare encounter during pregnancy — in emergency departments, jails, syringe service programs, and maternal and child health clinics — an opportunity to screen for syphilis.

So far, there is no official guidance on preconception screening for persons planning a pregnancy, according to Allison Bryant Mantha, MD, MPH, a maternal-fetal medicine specialist at Mass General Brigham health system and an associate professor at Harvard School of Medicine in Boston, who co-authored the ACOG advisory.

But Lynn M. Yee, MD, MPH, an associate professor of maternal-fetal medicine at Northwestern University Feinberg School of Medicine and director of the Northwestern Medicine Women’s Infectious Disease Program, said syphilis testing could easily be part of a prepregnancy “bucket” of health checkup items along with other sexually transmitted infections and blood pressure.

By the Numbers

In 2022, there were 3761 cases of congenital syphilis in the United States, including 231 stillbirths and 51 infant deaths — the highest number reported in more than 30 years and more than 10 times that reported in 2012.

At play may be social, economic, and immigration status factors creating barriers to prenatal care as well as declines in prevention infrastructure and resources.

Although most syphilis cases occur in men, the increase in incidence rate in women was two to four times higher than that of men from 2017 to 2021.

Why Such Persistently High Rates?

Despite a widely available test and cost-effective penicillin treatment covered by most insurance, congenital syphilis remains a challenge. According to Bryant, many mothers are still presenting for care and testing late in pregnancy. “Differential access to care is just one of many reasons,” she said.

Stigma and bias may also play a part, according to Yee. “Some clinicians may think their patient population is not the kind to be at risk and doesn’t need to be screened,” she said. Furthermore, screening is not a one-off test but a two-step process, and serology results can be hard to understand and easy to misinterpret.

In addition, some situations may promote ongoing disease, according to Yee. “Reinfection can occur after treatment if a patient keeps returning to a partner who refuses treatment,” Yee said.

On an optimistic note, however, the Centers for Disease Control and Prevention (CDC) reports that in some areas increases in newborn syphilis cases appear to be slowing — with a 3% increase in 2022 than with a 30% or higher annual increases in previous years. In 2020-2021, for example, congenital cases rose by 32% and resulted in 220 stillbirths and infant deaths.

Going Forward

The USPSTF statement identifies knowledge gaps. These include studies to evaluate the benefits and harms of repeat screening later in pregnancy and to evaluate the benefits and harms of such strategies as rapid point-of-care tests. The USPSTF also called for research on disparities in syphilis incidence and screening rates to reduce these disparities in populations.

Within these vulnerable groups, the CDC noted that babies born to Black, Hispanic, or Native American/Alaska Native mothers in 2021 were as much as eight times more likely to have congenital syphilis than those born to their White counterparts.

Jaén, Bryant, and Yee had no competing interests relevant to their comments.

Diana Swift is a freelance medical journalist based in Toronto.