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Dynamics of CD4+ T cell percentages in peripheral blood (A) and axillary lymph node (B) of immunized and non-immunized macaques following SIVMAC251 challenge. Note all non-immunized (naïve) challenged macaques had a rapid decrease in CD4+ T cells by day 14 after challenge in both peripheral blood and LN (red lines) whereas CD4+ T cells were preserved in immunized macaques. InRh macaques are delineated by dashed lines.
