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Plasma viral load in passively immunized macaques after repeated i.v. SHIV-SF162P4/C challenge. Immune sera from protected animals F42 and F44 were transferred to naïve animals F101 and F102, while control serum was given to F118 and F119. Starting the following day, all animals were challenged i.v. twice weekly for 3 weeks with 0.6 AID50 of SHIV-SF162P4/C (dashed lines).
