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Syphilis is believed to have infected 12 million
people in 1999, with greater than 90% of cases in the
developing world (Stamm, 2010). It affects between
700,000 and 1.6 million pregnancies a year, resulting
in spontaneous abortions, stillbirths, and congenital
syphilis. In sub-Saharan Africa, syphilis contributes
to approximately 20% of perinatal deaths (Woods,
2009). Rates are proportionally higher among
intravenous drug users,
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