Abstract
BackgroundDespite an otherwise robust national antenatal clinic program, maternal and congenital syphilis remains an important public health issue in Zambia. This case series reports the clinical presentation of seven infants diagnosed with congenital syphilis in Lusaka, Zambia.Case presentationsThe cases in this series were incidental findings from a cohort of infants enrolled in a rotavirus vaccine immunogenicity study recruiting infants at 6 weeks of age. As part of clinical care for enrolled participants, we screened mothers of children who presented with adverse events of (i) repeated upper respiratory tract infections/coryza, (ii) skin lesions, and (iii) poor weight gain, for syphilis using rapid plasma reagin test. From a cohort of 214 mother–infant pairs enrolled between September and December 2018, a total of 115 (44.4%) of the mothers reported to have not been screened during antenatal care. Of these, four (3.5%) reported to have tested positive; and only two received treatment. Seven out of 57 (26.6%) children meeting the screening criteria had a positive rapid plasma reagin test result. The mean age at diagnosis was 4.5 months (1.3 months standard deviation), and the common presenting features included coryza (6/7), skin lesions (4/7), conjunctivitis (3/7), pallor/anemia (5/7), wasting (2/7), and underweight (5/7). Three of the seven infants were exposed to human immunodeficiency virus. Following diagnosis, all seven cases received standard treatment according to national treatment guidelines. That is, 6/7 cases received inpatient care with benzylpenicillin for 10 days, while 1/7 was treated as an outpatient and received daily procaine penicillin for 10 days.ConclusionThese findings suggest that, though screening for syphilis is part of the standard antenatal care in Zambia, it is not offered optimally. There is urgent need to address programmatic shortcomings in syphilis screening and treatment to avoid long-term sequelae. Additionally, clinicians need to raise their index of suspicion and rule out syphilis when confronted with these clinical symptoms, regardless of the mother’s human immunodeficiency virus status.
Highlights
Despite an otherwise robust national antenatal clinic program, maternal and congenital syphilis remains an important public health issue in Zambia
Clinicians need to raise their index of suspicion and rule out syphilis when confronted with these clinical symptoms, regardless of the mother’s human immunodeficiency virus status
An earlier study looking at pregnant women admitted to the hospital whose pregnancies ended in either spontaneous abortion or stillbirth in 1982 found evidence of syphilis infection in up to 42% of women who aborted in the latter half of pregnancy [25]
Summary
The clinical presentation of congenital syphilis is often subtle and nonspecific, which can lead to delays in diagnosis and treatment of cases. Clinicians need to raise their index of suspicion and rule out syphilis when confronted with these clinical symptoms in both HIV-exposed and non-exposed infants. Robust screening of pregnant women during antenatal care is an effective way to reduce maternal syphilis and subsequent congenital transmission. These findings suggest that, screening for syphilis is part of the standard antenatal in Zambia, it is not offered optimally. There is urgent need to address programmatic shortcomings in maternal syphilis screening and treatment to avoid long-term sequelae in infants
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