G6PD and syphilis: The distribution of sickling positivity and infection among the G6PDd women is shown in Figure 2A. The percentages of G6PDd women with sickling positivity, malaria, hepatitis B, syphilis, and HIV were 9.6%, 5.2%, 3.9%, 0.3%, and 0.4%, respectively (Figure 2A), while in the normal G6PD women the percentages were quite comparable (Figure 2B).