Summary
Eighteen Rhesus monkeys were immunized with a fresh or lyophilized antigen preparation obtained from erythrocytes infected with Plasmodium knowlesi. Sixteen of these monkeys showed a positive delayed hypersensitivity response when subsequently skin tested with the immunizing antigen. Ten of the 16 positive reactors survived a P. knowlesi challenge, the remaining 6 showed several indications of protection. None of the 18 control monkeys gave a positive skin reaction or survived the challenging inoculum. Macro- and microscopical evidence suggests that the dermal reaction is of a delayed type.
Preliminary biochemical analysis of the antigen used in this experiment is included and its significance is discussed. Hematological data is also presented.
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Supported by the Agency for International Development, U.S. Department of State, Contract No. AID/csd-3689
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Cabrera, E.J., Speer, C.A., Schenkel, R.H. et al. Delayed dermal hypersensitivity in Rhesus monkeys (Macaca mulatta) immunized against Plasmodium knowlesi . Z. F. Parasitenkunde 50, 31–42 (1976). https://doi.org/10.1007/BF00389929
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DOI: https://doi.org/10.1007/BF00389929