The emergence of Toxoplasma gondii as a major opportunistic organism i
n immunocompromised individuals and the steady increase in economic lo
sses due to animal toxoplasmosis have fuelled the interest in vaccine
development In this review, Fausto Araujo addresses aspects of vaccina
tion against T. gondii with regard to the problem posed by this parasi
te to pregnant women and to severely immunocompromised individuals.