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Plasma viral load comparison of SHIV-325c challenge stocks. Plasmid viral loads were analyzed for parental SHIV-325c (black), SHIV-325c pool (red), and SHIV-325cH (green) challenge stocks at peak viremia (A) and at week 20 (B). Note that week 22 plasma viral loads were used for SHIV-325cH. *, P < 0.05; unpaired t test.
