Pregnant women, Syphilis testing, Congenital syphilis, Seroprevalence, Gravidity, Antenatal care.
 M. De Santis, C. De Luca, I. Mappa, T. Spagnuolo, A. Licameli, and G. Straface, "Syphilis infection during pregnancy: Fetal risks and clinical management," Infectious Diseases in Obstetrics and Gynecology, vol. 2012, p. 5, 2012. Available at: https://doi.org/10.1155/2012/430585.
 S. M. Nonato, A. P. S. Melo, and M. D. C. Guimarães, "Syphilis in pregnancy and factors associated with congenital syphilis in Belo Horizonte-MG, Brazil, 2010-2013," Epidemiology and Serviços de Saúde, vol. 24, pp. 681-694, 2015.
 A. Assefa, "A three year retrospective study on seroprevalence of syphilis among pregnant women at Gondar University Teaching Hospital, Ethiopia," African Health Sciences, vol. 14, pp. 119-124, 2014. Available at: https://doi.org/10.4314/ahs.v14i1.18.
 M. Magalhães, L. Basto, A. L. Areia, S. Franco, M. E. Malheiro, M. E. Afonso, and P. Moura, "Syphilis in pregnancy and congenital syphilis: Reality in a portuguese central university hospital," Revista Brasileira de Ginecologia e Obstetrícia/RBGO Gynecology and Obstetrics, vol. 39, pp. 265-272, 2017. Available at: https://doi.org/10.1055/s-0037-1603646.
 Z.-Q. Chen, G.-C. Zhang, X.-D. Gong, C. Lin, X. Gao, G.-J. Liang, X.-L. Yue, X.-S. Chen, and M. S. Cohen, "Syphilis in China: Results of a national surveillance programme," The Lancet, vol. 369, pp. 132-138, 2007. Available at: https://doi.org/10.1016/s0140-6736(07)60074-9.
 Z. Mekonnen, B. Tegbaru, and H. Meless, "Seroprevalence of syphilis and HIV-1 among pregnant women attending antenatal clinic in Jimma Hospital, Southwestern Ethiopia," Ethiopian Journal of Health Sciences, vol. 12, pp. 81-89, 2002.
 C. Boller, K. Wyss, D. Mtasiwa, and M. Tanner, "Quality and comparison of antenatal care in public and private providers in the United Republic of Tanzania," Bulletin of the World Health Organization, vol. 81, pp. 116-122, 2003.
 I. K. Jallow, Y.-J. Chou, T.-L. Liu, and N. Huang, "Women's perception of antenatal care services in public and private clinics in the Gambia," International Journal for Quality in Health Care, vol. 24, pp. 595-600, 2012. Available at: https://doi.org/10.1093/intqhc/mzs033.
 S. Gloyd, S. Chai, and M. A. Mercer, "Antenatal syphilis in sub-Saharan Africa: Missed opportunities for mortality reduction," Health Policy and Planning, vol. 16, pp. 29-34, 2001. Available at: https://doi.org/10.1093/heapol/16.1.29.
 K. A. Workowski and G. A. Bolan, "Sexually transmitted diseases treatment guidelines, 2015, MMWR. Recommendations and reports: Morbidity and mortality weekly report," Recommendations and Reports, vol. 64, pp. 1-137, 2015.
 B. Munkhuu, T. Liabsuetrakul, V. Chongsuvivatwong, A. Geater, and R. Janchiv, "Coverage of antenatal syphilis screening and predictors for not being screened in Ulaanbaatar, Mongolia," Sexually Transmitted Diseases, vol. 33, pp. 284-288, 2006. Available at: https://doi.org/10.1097/01.olq.0000194577.71693.c7.
 C. S. Rodrigues, M. D. C. Guimarães, and C. C. César, "Missed opportunities for congenital syphilis and HIV perinatal transmission prevention," Public Health Magazine, vol. 42, pp. 851-858, 2008. Available at: https://doi.org/10.1590/s0034-89102008000500010.
 M. J. Trepka, S. A. Bloom, G. Zhang, S. Kim, and R. E. Nobles, "Inadequate syphilis screening among women with prenatal care in a community with a high syphilis incidence," Sexually Transmitted Diseases, vol. 33, pp. 670-674, 2006. Available at: https://doi.org/10.1097/01.olq.0000216032.52731.ea.
 E. G. Lago, L. C. Rodrigues, R. M. Fiori, and A. T. Stein, "Congenital syphilis: Identification of two distinct profiles of maternal characteristics associated with risk," Sexually Transmitted Diseases, vol. 31, pp. 33-37, 2004. Available at: https://doi.org/10.1097/01.olq.0000105003.72411.fb.
 M. Rathore, S. Swami, B. Gupta, V. Sen, B. Vyas, A. Bhargav, and R. Vyas, "Community based study of self reported morbidity of reproductive tract among women of reproductive age in rural area of Rajasthan," Indian Journal of Community Medicine, vol. 28, p. 117, 2003.