The Mortality of Congenital Syphilis

Area of Science:

• Medical research
• Infectious diseases
• Public health

Background:

• Congenital syphilis poses a significant threat to fetal and neonatal health.
• Accurate assessment of congenital syphilis mortality is crucial for effective public health interventions.
• Existing surveillance definitions may not fully capture the true case-fatality rate.

Purpose of the Study:

• To determine the case-fatality rate (CFR) of congenital syphilis using advanced diagnostic tools.
• To compare this CFR with that derived from the Centers for Disease Control and Prevention (CDC) surveillance case definition.
• To evaluate the impact of diagnostic methodologies on mortality assessment in congenital syphilis.

Main Methods:

• A prospective, single-site cohort study of maternal-infant syphilis cases from 1984 to 2002.
• Diagnosis of congenital syphilis involved molecular tools (PCR), rabbit infectivity testing (RIT), and standard clinical/laboratory criteria.
• Retrospective review of data to ascertain fetal and neonatal mortality.

Main Results:

• 191 cases of congenital syphilis were identified, with a CFR of 31% (59 deaths).
• Stillbirths accounted for 90% of deaths, with most occurring in the third trimester.
• The CDC surveillance case definition identified all cases but underestimated the CFR by over 300% (10% vs. 31%).

Conclusions:

• The CDC surveillance definition is sensitive for case identification but significantly underestimates congenital syphilis mortality.
• The true CFR of congenital syphilis is approximately 31%, largely due to third-trimester stillbirths.
• Early detection and prompt treatment of syphilis in pregnant women are critical to reduce congenital syphilis-related mortality.