Recent advances in our understanding of the immunological mechanisms i
nvolved during infection with Toxoplasma gondii include evidence for t
he role of different subsets of lymphocytes and cytokines in acute inf
ection as well as in reactivation of chronic infection. The mechanisms
of presentation of T. gondii antigen have been clarified recently, an
d animal models of toxoplasmosis that mimic disease observed in AIDS p
atients developed.