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(A) A schematic diagram demonstrating 18 animals were vaccinated with SIVΔnef and intra-vaginally challenged at week 5, week 20 or week 40 with SIVmac251. Three control animals were inoculated with SIVmac251 with each vaccination group. (B) Plasma viremia of control and SIVΔnef-vaccinated animals after vaginal challenge with SIVmac251.
