Fig. 1. Study Design.
(A) Timeline of immunizations and virus challenges. Fetal macaques were injected with SIVmac1A11 or PBS in the late first trimester (55±5 days gestation; term 165±10 days). Animals were then delivered by cesarean section at full term and immunized with either PBS or SIV antigens as neonates. At 16 weeks postnatal age, each animal was orally challenged with SIVmac239. Animals that did not demonstrate productive infection were then challenged intravenously between 37 and 57 weeks of age with SIVmac239 and followed for disease progression. (B) Summary of study groups.