The pilot field work has been completed for this prospective study of early pregnancy loss (miscarriage and stillbirth) in relation to DDT exposure. Enrollment began in 2010 and ended in 2012. Subjects were enrolled from 6 villages in Limpopo Province, South Africa, and DDT is currently in use for malaria control in 3 of them. Based on our experience with the women enrolled as of Feburary 1, 2011, we decided that the inital protocol (part 1) would not yield the required number of pregnancies, so the protocol was revised (part 2) and enrollment was resumed. We then determined that the protocol in part 2 would not succeed in enrolling a sufficient number of subjects, and we decided to halt the field work and abandon the effort to conduct the full study. 442 subjects were enrolled in part 1. About half of the enrolled subjects were from the villages sprayed with DDT. We sent the plasma specimens from the 442 subjects in part 1 to a laboratory for analysis of DDT levels. The DDT levels were surprizingly low, and we believe this may be partly because the malaria control teams had run out of DDT in recent years. We are still investigating the reasons for the low DDT levels. In addition, we will have the plasma analyzed for other analytes, to determine if any subjects have evidence of DDT-related abnormalities in liver function tests or other clinical chemistries. We also plan to assess exposure to indoor air pollution among the subjects in this study.
|Whitworth, Kristina W; Baird, Donna D; Steiner, Anne Z et al. (2015) Anti-Müllerian hormone and lifestyle, reproductive, and environmental factors among women in rural South Africa. Epidemiology 26:429-35|
|Whitworth, Kristina W; Bornman, Riana M S; Archer, Janet I et al. (2014) Predictors of plasma DDT and DDE concentrations among women exposed to indoor residual spraying for malaria control in the South African Study of Women and Babies (SOWB). Environ Health Perspect 122:545-52|