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Pools of rat antiserum toPlasmodium berghei had different levels of protective activity as assessed by a passive transfer test. Preincubation of parasite inocula with an effective pool before injection did not significantly enhance protective activity. Removal of the antiserum from preincubated parasite inocula abolished the bulk of protective activity. Similarly, antiserum effective in intact animals was largely ineffective in splenectomized recipients. These experiments suggest a minimal role for antibody acting directly onP. berghei -parasitized cells and reemphasize a significant role for the spleen in immunity to this plasmodium.

Immunity to Plasmodium berghei in Rats: Passive Serum Transfer and Role of the Spleen