Ocular toxoplasmosis: the role of cellular immune defense in the development of recurrences. Results from animal experiments.
1992
: Five toxoplasmosis-free animals and ten animals that had been immunized intraocularly against toxoplasma organisms were used in a rabbit model of ocular toxoplasmosis. Five of the ten immune animals were immunosuppressed by cyclosporin A at a cellular level. Experimental toxoplasmic retinochoroiditis occurred in all animals, a process that in complete contradiction to experience reported previously. In the rabbit model, immunity after a past history of toxoplasma infection has thus far appeared to be a safe form of protection from experimental ocular toxoplasmosis. The concept of "immunological privilege of the eye" is discussed as the cause for the unexpected results.
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