Lewis rats recovered from experimental allergic encephalomyelitis (EAE) are resistant to active reinduction of disease. (DA X Lewis)F1 hybrids behave in an identical fashion. The induction of a graft versus host (GVH) reaction in EAE convalescent (DA X Lewis)F1 rats, by injection of normal parental (Lewis) lymphocytes, precipitates a second episode of EAE in a proportion of rats. This secondary episode of EAE can be induced by injection of parental cells either systemically (intravenously) or locally (subcutaneously in the foot). A host versus graft (HVG) reaction does not reactivate EAE in the convalescent host. The observed effect is probably due to reactivation of EAE effector cells following the extensive nonspecific proliferation of host lymphoid cells which is a feature of GVH reactivity.
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