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Passive Immunity to Experimental Trypanosomiasis

John Richard Seed and Albert A. Gam
The Journal of Parasitology
Vol. 52, No. 6 (Dec., 1966), pp. 1134-1140
DOI: 10.2307/3276357
Stable URL: http://www.jstor.org/stable/3276357
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Passive Immunity to Experimental Trypanosomiasis
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Abstract

Complete protection against a monomorphic strain of Trypanosoma gambiense has been obtained by the passive transfer of antibody to infected mice and rabbits. The necessary experimental conditions for protection appear to be: (1) a sufficiently high protective antibody titer; and (2) the injection of a sufficiently small challenge inoculum. Evidence is presented which is consistent with the hypothesis that relapses in experimental infections are due to the selection of an antigenic mutant from a heterogeneous population. It is therefore assumed that a small challenge injection is necessary to decrease the probability of the presence of an antigenic mutant in the challenge inoculum. In our system, each trypanosome is not capable of changing its antigenic composition.

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